William I may refer to: William the Conqueror (c. 1028–1087), also known as William I, King of England William I of Sicily (died 1166) William I of Scotland (died 1214), known as William the Lion William I of the Netherlands and Luxembourg (1772–1843) William I of Bimbia (fl. 1850s) William I of Württemberg (1781–1864) William I, German Emperor (1797–1888) 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, Lord of Douglas (died c. 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 of Guelders and Jülich (1364–1402) William I, Margrave of Meissen (1343–1407), known as William I, the one-eyed William I, Landgrave of Hesse (1466–1515) William I, Count of Nassau-Siegen (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) King William (disambiguation) Prince William (disambiguation) List of people named William § Royalty and nobility This disambiguation page lists articles about people with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article.