1603- 1641), also Pratap Singha, was the 17th and one of the most prominent kings of the Ahom kingdom. As he was advanced in years when he became king, he is also called the Burha Raja (Old king). His reign saw an expansion of the Ahom kingdomto the west, the beginning of the Ahom-Mughal conflicts, and a reorganization of the kingdom with an expanded Paik systemand reoriented village economy designed by Momai Tamuli Borbarua. His expansion to the west is underlined by the two new offices that he created: that of the Borbaruaand the Borphukan. The alliances he formed with the rulers of Koch Hajoresulted in formation that successfully thwarted Mughal expansion. The administrative structure that he created survived till the end of the Ahom kingdom in 1826.
Langi Gohain, the son of king Sukhamphaa, was installed as the
Swargadeoby the ministers Tonkham Borgohain, Chaopet Burhagohain and Banjangi Borpatrogohain after the death of his father in 1603. [Harvcol|Gogoi|1968|p=331] At his coronation he was 58 and he assumed the name Susenghphaa accorded to him by the Tai priests. He accepted an offer of marriage to the Jaintia princess and the subsequent events brought him into conflict with the Kachari kingdom. [Harvcol|Gogoi|1968|pp=333-335] He also established alliance with the Koch Hajorulers by marrying Mangaldahi, the daughter of Parikshit Narayan, in 1608. [Harvcol|Gogoi|1968|p=341]
According to historian Late Benudhar Sarma, the present form of worship of
Durgawith earthen idol in Assam was started during the reign of King Susenghphaa or Pratap Singha. The King heard about the festivity, the pomp and grandeur with which the King Naranarayan of Koch Bihar celebrated Durga Pujafrom one Sondar Gohain, who was under captivity of the Koch raja. King Pratap Singha sent artisans to Koch Biharto learn the art of idol making. The King organised the first such Durga Puja celebration in Bhatiapara near Sibsagar. This was the first time Durga Puja with earthen idols in Assam was held for the masses, in addtion to the worship in Durga temples.
The conflict between
Koch Biharand Koch Hajodrew the Mughals and finally the Ahoms into the conflict in 1615, which finally ended in 1682with Supaatphaaa later Ahom Swargadeo removing Mughal influence for ever from Assam. An interim truce ( Treaty of Asurar Ali) was signed during Susenghphaa's reign. A necessary outcome of the Ahom-Mughal conflictswas cessation of Ahom-Kachari hostilities and restoration of peace, to confront a common enemy. [Harvcol|Gogoi|1968|p=351]
As the Mughal attacks weakened
Koch Hajostate powers and Ahom influence spread west, Susenghphaa appointed Langi Panisiya the first Borphukanas his western viceroy, based at Kajali, and in charge of all Ahom territories west of Kaliabor. [Harvcol|Gogoi|1968|p=365] The three classes of ministers Burhagohain, Borgohainand Borpatrogohainhad their well defined areas to rule and function, and those part of the kingdom which did not fall under their jurisdiction were brought under the control of the Borbarua, a new office that was also created during the rule of Pratap Singha. Under him Momai Tamuli Borbarua, the first Borbarua, made extensive changes to the Paik systemand village economy. [Harvcol|Gogoi|1968|p=382]
He redistributed populations to consolidate his rule. He moved the Bhuyans, the remnant of the
Bhuyan chieftains, from the north to the south bank of the Brahmaputra, decreasing their power considerably. He moved eight thousand families to the sparsely populated Marangi area which was originally recovered from the Kachari kingdomby Suhungmung.
Creation of other posts like "Rohiyal Barua", "Jagiyal Gohain", "Kajalimukhiya Gohain" is also credited to him. For his organizational capability, political acumen and his wisdom, he was also known as "Buddhi Swarganarayan".
Pratap Singha died in the year
1641after a long reign of 38 years. Although a great part of his reign was distracted by wars with the Kacharis and the Mughals, he was still able to devote much attention the internal organisation of his kingdom, development of backward tracts and construction of roads, embankments and tanks.
last = Gogoi
first = Padmeshwar
title = The Tai and the Tai Kingdoms
publisher = Gauhati University
year = 1968
location = Guwahati
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