William I, Count of Luxembourg (1081–1131) was

Count of Luxembourg The territory of Luxembourg has been ruled successively by counts, dukes and grand dukes. It was part of the medieval Kingdom of Germany, and later the Holy Roman Empire until it became a sovereignty, sovereign state in 1815. Counts of Luxembourg ...

from 1096 until his death in 1131, succeeding his elder brother Henry III of Luxembourg. They were both sons of Conrad I and Clementia of Aquitaine. William was the first of his family to use the title ''Count of Luxembourg'' in his documents. Like his predecessors, William was embroiled in debates with Bruno, the

Archbishop of Trier The Diocese of Trier (), in English historically also known as ''Treves'' () from French ''Trèves'', is a Latin Church ecclesiastical territory or diocese of the Catholic church in Germany.Conrad II († 1136), Count of Luxembourg * William, Count of Gleiberg, documented in 1131 and in 1158 *Liutgarde (* 1120 - † 1170), married Henri II (* 1125 - † 1211), Count of Grandpré Upon his death in 1131, William was succeeded as Count of Luxembourg by his eldest son Conrad II.

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* * 1081 births 1131 deaths 11th-century monarchs of Luxembourg 12th-century monarchs of Luxembourg Counts of Luxembourg House of Luxembourg 11th-century counts in Europe 12th-century counts in Europe People excommunicated by the Catholic Church {{Luxembourg-noble-stub