- William I
William I may refer to:
Kings
*
William I of England (c. 1028–1087) known as William the Conqueror
*William I of Sicily (died 1166)
*William I of Scotland (died 1214)
*William I of the Netherlands (1772–1843)
*William I, German Emperor (1797–1888)
*William I of Bimbia (fl. 1850s)Nobles
*
William I of Gascony (died 848)
*William I of Aquitaine (died 918)
*William I of Montferrat (fl. 924)
*William I of Normandy (c. 900–942)
*William I of Montpellier (fl. 980s)
*William I of Provence (c. 950–993)
*William I Talvas (c. 995–after 1030), seigneur of Alençon
*William Iron Arm (before 1010–1046), Duke of Apulia
*William I, Bishop of Utrecht (died 1076)
*William I, Count of Nevers (c. 1030–after 1083)
*William I, Count of Burgundy (1020–1087)
*William de Warenne, 1st Earl of Surrey (died 1088)
*William I of Cerdanya (1068–1095)
*William I of Bures (died 1142), French crusader
*William I of Béarn (died 1173)
*William le Gros, 1st Earl of Albemarle (died 1179)
*William I of Geneva (fl. 1190s)
*William of Champlitte (died 1209), Prince of Achaea
*William I of Cagliari (c. 1160–1214)
*William I, Count of Holland (c. 1167–1222)
*Uilleam I, Earl of Ross (died 1274)
*William I de la Roche (died 1287), Duke of Athens
*William I, Count of Hainaut (1286–1337)
*William I, Duke of Bavaria (1330–1389)
*William I, Landgrave of Hesse (1466–1515)
*William I, Count of Nassau-Dillenburg (1487–1559)
*William the Silent (1533–1584), Prince of Orange
*Guglielmo I Gonzaga (1538–1587), Duke of Mantua
*William I, Elector of Hesse (1743–1821)
*William I of Württemberg (1781–1864)
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