Fulk V of Anjou in the context of "Husband and co-ruler"

Henry I (c. 1068 – 1 December 1135), also known as Henry Beauclerc, was King of England from 1100 to his death in 1135. He was the fourth son of William the Conqueror and was educated in Latin and the liberal arts. On William's death in 1087, Henry's elder brothers Robert Curthose and William Rufus inherited Normandy and England, respectively, thereby leaving Henry landless. He subsequently purchased the County of Cotentin in western Normandy from Robert, but his brothers deposed him in 1091. He gradually rebuilt his power base in the Cotentin and allied himself with William Rufus against Robert.

When William died in a hunting accident, Henry seized the English throne ahead of Robert, promising at his coronation to correct many of William's less popular policies. He married Matilda of Scotland and they had two surviving children, Empress Matilda and William Adelin. Robert disputed Henry's control of England and invaded from Normandy in 1101. The ensuing military campaign ended in a negotiated settlement that confirmed Henry as king. The peace was short-lived, however, and Henry invaded the Duchy of Normandy in 1105 and 1106, finally defeating Robert at the Battle of Tinchebray. Henry kept Robert imprisoned for the rest of his life. Henry's control of Normandy was subsequently challenged by Louis VI of France, Baldwin VII of Flanders and Fulk V of Anjou, who promoted the rival claims of Robert's son, William Clito, and supported a major rebellion in the Duchy between 1116 and 1119. Following Henry's victory at the Battle of Brémule, a favourable peace settlement was agreed with Louis in 1120.