- Treaty of Devol
The Treaty of Devol was an agreement made in 1108 between Bohemond I of
Antiochand Byzantine Emperor Alexios I Komnenos, in the wake of the First Crusade. Although the treaty was not immediately enforced, it was intended to make the Principality of Antiocha vassalstate of the Byzantine Empire.
At the beginning of the
First Crusade, Crusader armies assembled at Constantinopleand promised to return to the Byzantine Empire any land they might conquer. However, Bohemond, the son of Alexios' former enemy Robert Guiscard, claimed the Principality of Antiochfor himself. Alexios did not recognize the legitimacy of the Principality, and Bohemond went to Europe looking for reinforcements. He launched into open warfare against Alexios, but he was soon forced to surrender and negotiate with Alexios at the imperial camp at Diabolis (Devol), where the Treaty was signed.
Under the terms of the Treaty, Bohemond agreed to become a vassal of the Emperor and to defend the Empire whenever needed. He also accepted the appointment of a Greek Patriarch. In return, he was given the titles of "sebastos" and "doux" (duke) of Antioch, and he was guaranteed the right to pass on to his heirs the
County of Edessa. Following this, Bohemond retreated to Apuliaand died there. His nephew, Tancred, who was regent in Antioch, refused to accept the terms of the Treaty. Antioch came temporarily under Byzantine sway in 1137, but it was not until 1158 that it truly became a Byzantine vassal.
The Treaty of Devol is viewed as typical example of the Byzantine tendency to settle disputes through diplomacy rather than warfare, and was both a result of and a cause for the distrust between the Byzantines and their
Western European neighbors.
In 1097, the Crusader armies assembled at Constantinople having traveled in groups eastward through Europe. Alexios I, who had requested only some western knights to serve as mercenaries to help fight the
Seljuk Turks, blockaded these armies in the city and would not permit them to leave until their leaders swore oaths promising to restore to the Empire any land formerly belonging to it that they might conquer on the way to Jerusalem. [Spinka, "Latin Church of the Early Crusades", 113] The Crusaders eventually swore these oaths, individually rather than as a group; some, such as Raymond IV of Toulouse, were probably sincere, but others, such as Bohemond, probably never intended to honor their promise. In return, Alexios gave them guides and a military escort.Anna Komnene, "The Alexiad", X, [http://www.fordham.edu/halsall/basis/AnnaComnena-Alexiad10.html 261] ] The Crusaders were however exasperated by Byzantine tactics, such as negotiating the surrender of Nicaea from the Seljuks while it was still under siegeby the Crusaders, who hoped to plunder it to help finance their journey. The Crusaders, feeling betrayed by Alexios, who was able to recover a number of important cities and islands, and in fact much of western Asia Minor, continued on their way without Byzantine aid. In 1098, when Antiochhad been captured after a long siege and the Crusaders were in turn themselves besieged in the city, Alexios marched out to meet them, but, hearing from Stephen of Blois that the situation was hopeless, he returned to Constantinople.Runciman, "The First Crusade", 182-3] The Crusaders, who had unexpectedly withstood the siege, believed Alexios had abandoned them and considered the Byzantines completely untrustworthy.Runciman, "The First Crusade", 183] Therefore, they regarded their oaths as invalidated.Anna Komnene, "The Alexiad", XI, [http://www.fordham.edu/halsall/basis/annacomnena-alexiad11.html 291] ]
By 1100, there were several
Crusader states, including the Principality of Antioch, founded by Bohemond in 1098. It was argued that Antioch should be returned to the Byzantines, despite Alexios's supposed betrayals, [ Raymond of Aguilers(III, 67) reports that Raymond de St.-Gilles opposed Bohemond's retention of Antioch on the ground that "we swore to the Emperor upon the Cross of the Lord and the crown of thorns, and upon many other sacred objects, that we would not retain without his will any city or fortress of all that belonged to his Empire." Nevertheless, after the capture of Antioch, the oath of allegiance was in the end repudiated (Spinka, "Latin Church of the Early Crusades", 113).] but Bohemond claimed it for himself.M. Angold, "The Byzantine Empire, 1025-1118", 251] Alexios, of course, disagreed; Antioch had an important port, was a trade hub with Asiaand a stronghold of the Eastern Orthodox Church, with an important Greek Patriarch. It had only been captured from the empire a few decades previously, unlike Jerusalem, which was much farther away and had not been in Byzantine hands for centuries. Alexios, therefore, did not recognize the legitimacy of the Principality, believing it should be returned to the Empire according to the oaths Bohemond had sworn in 1097. He therefore set about trying to evict Bohemond from Antioch.
Bohemond added a further insult to both Alexios and the Orthodox Church in 1100 when he appointed Bernard of Valence as the Latin Patriarch, and the same time expelled the Greek Patriarch,
John the Oxite, who fled to Constantinople. [John IV of Antioch initially stayed in Antioch after the Crusaders captured his city, and presided over both Greek and Latin clergy. He later quarreled with Bohemond, fled to Constantinople and abdicated (T.M. Kolbaba, "Byzantine Perceptions of Latin Religious "Errors", [http://www.doaks.org/Crusades/CR09.pdf 126] ).] Soon after, Bohemond was captured by the Danishmendsof Syriaand was imprisoned for three years, during which the Antiochenes chose his nephew Tancred as regent.Runciman, "The First Crusade", 232] After Bohemond was released, he was defeated by the Seljuks at the Battle of Harranin 1104; this defeat led to renewed pressure on Antioch from both the Seljuks and the Byzantines. Bohemond left Tancred in control of Antioch and returned in the West, touring Italyand Francefor reinforcements. He won the backing of Pope Paschal II[Modern scholars argue that Bohemond's planned attack on Epirus was kept secret from the Pope, who thought that he intended to launch a campaign in the Levant(J.G. Rowe, "Paschal II", 181; J. Holifield, "Tancred and Bohemond", [http://www.leeds.ac.uk/history/studentlife/e-journal/Holifield_Jessica.pdf 17] ).] and the support of the French King Philip I, whose daughter he married. It is unclear whether his expedition qualified as a crusade.
Bohemond's Norman relatives in
Sicilyhad been in conflict with the Byzantine Empire for over 30 years; his father Robert Guiscardwas one of the Empire's strongest enemies. While Bohemond was away Alexios sent an army to reoccupy Antioch and the cities of Cilicia. In 1107, having organized a new army for his planned crusade against the Muslims in Syria, Bohemond instead launched into open warfare against Alexios, crossing the Adriaticto besiege Dyrrhachium, the westernmost city of the Empire.Anna Komnene, "The Alexiad", XII, [http://www.fordham.edu/halsall/basis/AnnaComnena-Alexiad12.html 317]
* M. Angold, "The Byzantine Empire, 1025-1118", 251
* Norwich, "Byzantium:The Decline and Fall", 47] Like his father, however, Bohemond was unable to make any significant advances into the Empire; Alexios avoided a pitched battle and Bohemond's siege failed, partly due to a plague among his army.Norwich, "Byzantium:The Decline and Fall", 48] Bohemond soon found himself in an impossible position isolated in front of Dyrrhachium: his escape by sea was cut off by the Venetians, and Paschal II withdrew his support.M. Angold, "The Byzantine Empire, 1025-1118", 251
* S. Runciman, "The First Crusade", 232]
In September 1108, Alexios requested that Bohemond negotiate with him at the imperial camp at Diabolis (Devol). Bohemond had no choice but to accept, now that his disease-stricken army would no longer be able to defeat Alexios in battle. He admitted that he had violated the oath sworn in 1097,Anna Komnene, "The Alexiad", XIII, [http://www.fordham.edu/halsall/basis/annacomnena-alexiad13.html 348-349]
* Norwich, "Byzantium:The Decline and Fall", 48] but refused to acknowledge that it had any bearing on the present circumstances, as Alexios, in Bohemond's eyes, had also violated the agreement by turning back from the siege of Antioch in 1098. Alexios agreed to consider the oaths of 1097 invalid.The only clause of Alexios and Bohemond's previous agreement that was not declared void was the latter's swearing "liege-homage" to Alexios (Anna Komnene, "The Alexiad", XIII, [http://www.fordham.edu/halsall/basis/annacomnena-alexiad13.html 349] ).] The specific terms of the treaty were negotiated by the general
Nikephoros Bryennios, and were recorded by Anna Komnene:Anna Komnene, "The Alexiad", XIII, [http://www.fordham.edu/halsall/basis/annacomnena-alexiad13.html 348-358] ]
*Bohemond agreed to become a vassal of the emperor, and also of Alexios' son and heir John;Anna Komnene, "The Alexiad", XIII, [http://www.fordham.edu/halsall/basis/annacomnena-alexiad13.html 349-350]
* Norwich, "Byzantium:The Decline and Fall", 48]
*He agreed to help defend the empire, wherever and whenever he was required to do so, and agreed to an annual payment of 200 talents in return for this service;
*He was given the title of "sebastos", as well as "doux" (duke) of Antioch;
*He was granted as imperial fiefs Antioch and
Aleppo(the latter of which neither the Crusaders nor the Byzantines controlled, but it was understood that Bohemond should try to conquer it);
*He agreed to return Laodicea and other Cilician territories to Alexios;
*He agreed to let Alexios appoint a Greek patriarch "among the disciples of the great church of Constantinople" (The restoration of the Greek Patriarch marked the acceptance of submission to the empire, but posed canonical questions, which were difficult to resolveJ. Richard, "The Crusades, c.1071 - c.1291", 131] ).Anna Komnene, "The Alexiad", XIII, [http://www.fordham.edu/halsall/basis/annacomnena-alexiad13.html 354-355]
* Norwich, "Byzantium:The Decline and Fall", 48]
The terms were negotiated according to Bohemond's western understanding, so that he saw himself as a feudal vassal of Alexios, a "liege man" ("homo ligius" or "ἄνρωπος λίζιος") with all the obligations this implied, as customary in the West: he was obliged to bring military assistance to the Emperor, except in wars in which he was involved, and to serve him against all his enemies, in Europe and in Asia.J. Richard, "The Crusades, c.1071 - c.1291", 130]
Anna Komnene described the proceedings with very repetitive details, with Bohemond frequently pointing out his own mistakes and praising the benevolence of Alexios and the Empire; the proceedings must have been rather humiliating for Bohemond. On the other hand, Anna's work was meant to praise her father and the terms of the treaty may not be entirely accurate.
The oral agreement was written down in two copies, one given to Alexios, and the other given to Bohemond. According to Anna, the witnesses from Bohemond's camp who signed his copy of the treaty were Maurus,
bishop of Amalfiand papal legate, Renard, bishop of Tarentum, and the minor clergy accompanying them; the abbot of the monastery of St. Andrew in Brindisi, along with two of his monks; and a number of unnamed "pilgrims" (probably soldiers in Bohemond's army). From Alexios' imperial court, the treaty was witnessed by the sebastos Marinos of Naples, Roger son of Dagobert, Peter Aliphas, William of Gand, Richard of the Principate, Geoffrey of Mailli, Hubert son of Raoul, Paul the Roman, the ambassadors Peres and Simon from Hungary, and the ambassadors Basil the Eunuch and Constantine.Anna Komnene, "The Alexiad", XIII, [http://www.fordham.edu/halsall/basis/annacomnena-alexiad13.html 357-358] ] Many of Alexios' witnesses were themselves Westerners, who held high positions in the Byzantine armyand at the imperial court; [A. Kazhdan, "Latins and Franks in Byzantium", [http://www.doaks.org/Crusades/CR07.pdf 93-94] ] Basil and Constantine were ambassadors in the service of Bohemond's relatives in Sicily.
Neither copy survives. It may have been written in
Latin, Greek, or both. Both languages are equally likely given the number of westerners present, many of whom would have known Latin. It is not clear how far Bohemond's concessions were known across Latin Europeas only a few chroniclers mention the treaty at all; Fulcher of Chartressimply saysthat Bohemond and Alexios were reconciled.Fulcher of Chartres, "Expedition to Jerusalem", [http://gallica.bnf.fr/ark:/12148/bpt6k94616t/f37.table XXXV] ]
The Treaty was weighted in Alexios' favor and provided for the eventual absorption of Antioch and its territory into the Empire.P. Magdalino, "The Empire of Manuel I Komnenos", 31-32] Alexios, recognizing the impossibility of driving Bohemond out of Antioch, tried to absorb him into the structure of Byzantine rule, and put him work for the Empire's benefit.A. Jotischky, "Crusading and the Crusader States", 69
* P. Magdalino, "The Empire of Manuel I Komnenos", 33] Bohemond was to retain Antioch until his death with the title of "doux", unless the emperor (either Alexios or, in the future, John) chose for any reason to renege on the deal. The principality would revert to direct Byzantine rule on Bohemond's death. Bohemond therefore could not set up a dynasty in Antioch, although he was guaranteed the right to pass on to his heirs the County of Edessa, and any other territories he managed to acquire in the Syrian interior.
Bohemond's lands were to include St Simeon and the coast, the towns of
Baghrasand Artah, and the Latin possessions in the Jebel as-Summaq. Latakiaand Cilicia, however, were to revert to direct Byzantine rule. As Thomas Asbridgepoints out, much of what the Emperor granted to Bohemond (including Aleppo itself) was still in Muslim hands (e.g. neither Bohemond nor Alexios controlled Edessa, although at the time Tancred was regent there as well as in Antioch), which contradicts Lilie's assessment that Bohemond did well out of the Treaty.A. Jotischky, "Crusading and the Crusader States", 69] René Groussetcalls the Treaty a "diktat", but Jean Richard underscores that the rules of feudal lawto which Bohemond had to submit "were in no way humiliating." According to John W. Birkenmeier, the Treaty marked the point at which Alexios had developed a new army, and new tactical doctrines with which to use it, but it was not a Byzantine political success; "it traded Bohemond's freedom for a titular overlordship of Southern Italythat could never be effective, and for an occupation of Antioch that could never be carried out."J.W. Birkenmeier, "The Development of the Komnenian Army", 46]
The terms of the Treaty have been interpreted in various ways. According to Paul Magdalino and Ralph-Johannes Lilie, "the Treaty as reproduced by Anna Komnene shows an astonishing familiarity with western feudal custom; whether it was drafted by a Greek or by a Latin in imperial service, it had a sensitive regard for the western view of the "
status quo" in the East Mediterranean."P. Magdalino, "The Empire of Manuel I Komnenos", 31-32
A. Jotischky, "Crusading and the Crusader States", 69] So too did the diplomatic initiatives Alexios undertook, in order to enforce the Treaty on Tancred (such as the treaty he concluded with Pisa in 1110–1111, and the negotiations for Church union with Pascal II in 1112).P. Magdalino, "The Empire of Manuel I Komnenos", 32] In contrast, Asbridge has recently argued that the Treaty derived from Greek as well as western precedents, and that Alexios wished to regard Antioch as falling under the umbrella of "
Bohemond never returned to Antioch (he went to Sicily where he died in 1111), and the carefully constructed clauses of the Treaty were never implemented.S. Runciman, "The First Crusade", 232
* P. Stephenson, "Byzantium's Balkan Frontier", 183] Bohemond's nephew, Tancred, refused to honor the Treaty.J. Norwich, "Byzantium:The Decline and Fall", 46] In his mind, Antioch was his by
right of conquest. He saw no reason to hand it over to someone who had not been involved in the Crusade, and had indeed actively worked against it (as the Crusaders believed). The Crusaders seem to have felt Alexios had tricked Bohemond into giving him Antioch; they already believed Alexios was devious and untrustworthy and this may have confirmed their beliefs. The treaty referred to Tancred as the illegal holder of Antioch, and Alexios had expected Bohemond to expel him or somehow control him. Tancred also did not allow a Greek Patriarch to enter the city; instead, Greek Patriarchs were appointed in Constantinople and nominally held power there. The question of the status of Antioch and the adjacent Cilician cities troubled the Empire for many years afterwards. Although the Treaty of Devol never came into effect, it provided the legal basis for Byzantine negotiations with the crusaders for the next thirty years, and for imperial claims to Antioch during the reigns of John II and Manuel I.J.W. Birkenmeier, "The Development of the Komnenian Army", 46
* R.-J. Lilie, "The Crusades and Byzantium", 34] Therefore, John II attempted to impose his authority, traveling to Antioch himself in 1137 with his army and besieging the city.J. Norwich, "Byzantium:The Decline and Fall", 77] The citizens of Antioch tried to negotiate, but John demanded the unconditional surrender of the city.J. Norwich, "Byzantium:The Decline and Fall", 78] After asking the permission of the King of Jerusalem, Fulk, which he received, Raymond, the Prince of Antioch, agreed to surrender the city to John. The agreement, by which Raymond swore homage to John, was explicitly based on the Treaty of Devol, but went beyond it: Raymond, who was recognized as an imperial vassal for Antioch, promised the Emperor free entry to Antioch, and undertook to hand over the city in return for investiture with Aleppo,
Shaizar, Homsand Hamaas soon as these were conquered from the Muslims. Then, Raymond would rule the new conquests and Antioch would revert to direct imperial rule.A. Jotischky, "Crusading and the Crusader States", 77
* P. Magdalino, "The Empire of Manuel I Komnenos", 41] The campaign finally failed, however, partly because Raymond and
Joscelin II, Count of Edessa, who had been obliged to join John as his vassals, did not pull their weight. When, on their return to Antioch, John insisted on taking possession of the city, the two princes organized a riot.The inhabitants of Antioch were hostile to the prospect of passing under Byzantine rule, which seemed to them the inevitable consequence (J. Richard, "The Crusades, c.1071 - c.1291", 151).] John found himself besieged in the city, and was forced to leave in 1138, recalled to Constantinople.J. Richard, "The Crusades, c.1071 - c.1291", 151] He diplomatically accepted Raymond's and Joscelin's insistence that they had nothing to do with the rebellion. [J.W. Birkenmeier, "The Development of the Komnenian Army", 48
* P. Magdalino, "The Empire of Manuel I Komnenos", 41
* A. Stone, [http://www.roman-emperors.org/johncomn.htm John II Comnenus (A.D. 1118-1143)] ] John repeated his operation in 1142, but he unexpectedly died, and the Byzantine army retired.
It was not until 1158, during the reign of Manuel I, that Antioch truly became a vassal of the empire, after Manuel forced Prince
Raynald of Chatillonto swear fealtyto him in punishment for Raynald's attack on Byzantine Cyprus. [B. Hamilton, "William of Tyre and the Byzantine Empire", 226
* J. Norwich, "Byzantium:The Decline and Fall", 121
* William of Tyre, "Historia", XVIII, [http://thelatinlibrary.com/williamtyre/18.html#23 23] ] The Greek Patriarch was restored, and ruled simultaneously with the Latin Patriarch.J. Norwich, "Byzantium:The Decline and Fall", 122] Antioch, weakened by powerless regents after Raynald's capture by the Muslims in 1160, remained a Byzantine vassal state until 1182 when internal divisions following Manuel's death in 1180 hindered the Empire's ability to enforce its claim.
In the Balkan frontier, the Treaty of Devol marked the end of the Norman threat to the southern
Adriaticlittoral during Alexios' reign and later; the efficacy of the frontier defenses deterred any further invasions through Dyrrachium for most of the 12th century. [P. Stephenson, "Byzantium's Balkan Frontier", 183]
*cite book | author=Anna Komnene | authorlink=Anna Komnene| title=
The Alexiadtranslated by Elizabeth A. S. Dawes| publisher=Medieval Sourcebook|chapter=Books X-XIII|url=http://www.fordham.edu/halsall/basis/annacomnena-alexiad00.html#INTRODUCTION
*cite book | author=Fulcher of Chartres | authorlink=Fulcher of Chartres| title= A History of the Expedition to Jerusalem 1095-1127 (translated in English by Frances Rita Ryon, edited with an introduction by Harold S. Fink [The University of Tennessee Press, 1969] )| chapter=Chapter XXXV|url=http://gallica.bnf.fr/ark:/12148/bpt6k94616t/f37.table
William of Tyre, "Historia Rerum In Partibus Transmarinis Gestarum" ("A History of Deeds Done Beyond the Sea"), translated by E. A. Babock and A. C. Krey (Columbia University Press, 1943). See the original text in the [http://thelatinlibrary.com/williamtyre.html Latin library] .
*cite book | last=Angold | first=Michael | authorlink=Michael Angold| title=The New Cambridge Medieval History | editor=Rosamond McKitterick | publisher=Cambridge University Press | year=2005 | isbn=0-521-41411-3 | chapter=The Byzantine Empire, 1025-1118
*cite book | last=Birkenmeier | first=John W. | title=The Development of the Komnenian Army: 1081–1180 | publisher=Brill Academic Publishers | year=2002 | isbn=9-004-11710-5 | chapter=Historical Overview of the Eleventh- and Twelfth-Century Byzantium
*cite book | last=Hamilton | first=Bernard| title=Porphyrogenita: : Essays on the History and Literature of Byzantium and the Latin East in Honor of Julian Chrysostomides edited by Charalambos Dendrinos, Jonathan Harris, Eirene Harvalia-Crook and Judith Herrin| publisher=Ashgate Publishing, Ltd.| year=2003 | id=ISBN 0-754-636968 | chapter=William of Tyre and the Byzantine Empire
title = Tancred and Bohemond: Brothers-in-arms or Arch Rivals?
last = Holifield
first = Jessica
url = http://www.leeds.ac.uk/history/studentlife/e-journal/Holifield_Jessica.pdf
University of Leeds(School of History)
accessdate = 2007-09-12
*cite book | last=Jotischky | first=Andrew | title=Crusading And The Crusader States | publisher=Pearson Education | year=2004 | isbn=0-582-41851-8 | chapter=Crusade and Settlement, 1095-c. 1118
*cite book | last=Kazhdan | first=Alexander | title=The Crusades from the Perspective of Byzantium and the Muslim World | editor=Angeliki E. Laiou - Roy Parviz Mottahedeh| publisher=Dumbarton Oaks Research Library and Collection | year=2001 | location=Washington, D.C. | isbn=0-884-02277-3 | chapter=Latins and Franks in Byzantium: Perception and Reality from the Eleventh to the Twelfth Century | chapterurl=http://www.doaks.org/Crusades/CR09.pdf
*cite book | last=Kolbaba | first=Tia M. | title=The Crusades from the Perspective of Byzantium and the Muslim World | editor=Angeliki E. Laiou - Roy Parviz Mottahedeh| publisher=Dumbarton Oaks Research Library and Collection | year=2001 | location=Washington, D.C. | isbn=0-884-02277-3 | chapter=Byzantine Perceptions of Latin Religious Errors (Themes and Changes from 850 to 1350) | chapterurl=http://www.doaks.org/Crusades/CR07.pdf
*cite book | last=Lilie | first=Ralph-Johannes | title=The Crusades: Other Experiences, Alternate Perspectives | editor=Khalil I. Semaan | publisher=Global Academic Publishing | year=2003 | isbn=1-586-84251-X | chapter=The Crusades and Byzantium
*cite book | last=Magdalino | first=Paul| title=The Empire of Manuel I Komnenos, 1143–1180 | publisher=Cambridge University Press | year=2002 | isbn= 0-521-52653-1
*cite book | last=Norwich | first=John| title=Byzantium:The Decline and Fall | publisher=Penguin | year=1995 | isbn= 0-670-82377-5
*cite book | last=Richard | first=Jean | title=The Crusades, C. 1071-c. 1291 (translated by Jean Birrell)| publisher=Cambridge University Press | year=1999 | isbn=0-521-62566-1 | chapter=From the First to the Second Crusade
*cite journal |last=Rowe |first=John G. |authorlink= |coauthors= |year=1966-67 |month= |title=Paschal II, Bohemond of Antioch and the Byzantine Empire |journal=Bulletin of the John Rylands Library |volume=44 |issue= |pages=165–202 |id= |url= |accessdate= 2007-09-12 |quote=
*cite book | last=Runciman | first=Steven| title=The First Crusade | publisher=Cambridge University | year=1980 | isbn= 0-521-23255-4
*cite journal |last=Spinka |first=Matthew|authorlink= |coauthors= |year=1939|month=June |title=Latin Church of the Early Crusades |journal=Church History |volume=8 |issue=2 |pages=113–131 |id= |url=http://links.jstor.org/sici?sici=0009-6407(193906)8%3A2%3C113%3ALCOTEC%3E2.0.CO%3B2-8 |accessdate= 2007-09-20 |quote= |doi=10.2307/3160650
*cite book | last=Stephenson | first=Peter | title=Byzantium's Balkan Frontier: A Political Study of the Northern Balkans, 900-1204 | publisher=Cambridge University Press | year=2000 | isbn=0-521-77017-3 | chapter=The Rise of the West, I: Normans and Crusaders (1081-1118)
title = John II Comnenus (A.D. 1118-1143)
last = Stone
first = Andrew
url = http://www.roman-emperors.org/johncomn.htm
work= Online Encyclopedia of Roman Emperors
accessdate = 2007-09-11
*Thomas S. Asbridge, "The Creation of the Principality of Antioch, 1098–1130". The Boydell Press, 2000.
*Jonathan Harris, "Byzantium and the Crusades". Hambledon and London, 2003.
*Ralph-Johannes Lilie, "Byzantium and the Crusader States, 1096–1204". Trans. J.C. Morris and J.C. Ridings. Clarendon Press, 1993.
*Kenneth M. Setton, ed., "A History of the Crusades", Vols. II and V. Madison, 1969–1989.
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