William I of Sancerre (french: Guillaume de Sancerre, ca. 1176 – 1217) was the second Count of Sancerre, Lord of Saint-Brisson and

La Ferté-Loupière La Ferté-Loupière () is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France. The village is famous for its danse macabre, dating back from the beginning of the 16th century, in the church of Saint-Germain. See ...

from 1191 until his death. He was the eldest son of Stephen I, Count of Sancerre. In 1217 he accompanied his brother-in-law,

Peter II of Courtenay Peter, also Peter II of Courtenay (french: Pierre de Courtenay; died 1219), was emperor of the Latin Empire of Constantinople from 1216 to 1217. Biography Peter II was a son of Peter I of Courtenay (died 1183), a younger son of Louis VI of Fra ...

, who had just been elected

Latin Emperor The Latin Emperor was the ruler of the Latin Empire, the historiographical convention for the Crusader realm, established in Constantinople after the Fourth Crusade (1204) and lasting until the city was recovered by the Byzantine Greeks in 126 ...

, on his journey to

Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth ( Old Norse), Tsargrad ( Slavic), Qustantiniya (Arabic), Basileuousa ("Queen of Cities"), Megalopolis ( ...

. Both were captured and imprisoned by the ruler of

Epirus sq, Epiri rup, Epiru , native_name_lang = , settlement_type = Historical region , image_map = Epirus antiquus tabula.jpg , map_alt = , map_caption = Map of ancient Epirus by Heinrich ...

Theodore Komnenos Doukas Theodore Komnenos Doukas ( el, Θεόδωρος Κομνηνὸς Δούκας, ''Theodōros Komnēnos Doukas'', Latinized as Theodore Comnenus Ducas, died 1253) was ruler of Epirus and Thessaly from 1215 to 1230 and of Thessalonica and most of ...

, and died in prison. He was succeeded by his son,

Louis I Louis I may refer to: * Louis the Pious, Louis I of France, "the Pious" (778–840), king of France and Holy Roman Emperor * Louis I, Landgrave of Thuringia (ruled 1123–1140) * Ludwig I, Count of Württemberg (c. 1098–1158) * Louis I of Bloi ...

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* 1170s births 1217 deaths 12th-century French people 13th-century French people Counts of Sancerre Christians of the Crusades French people who died in prison custody Prisoners and detainees of the Despotate of Epirus House of Blois {{France-noble-stub