Alison Weir identifies a legitimate son of Robert Curthose’s called Henry who was killed in a hunting accident in the New Forest but there is no further information and for the most part William Clito is usually identified as Robert’s only legitimate issue. Robert also had illegitimate sons. One was called Richard who was killed in the New Forest in 1100. Richard had a full brother, confusingly enough, also called William and he became the Lord of Tortosa. It is assumed he was killed around 1110 at the Battle of Jerusalem as there is no further record of him after that.
Disaster struck Henry I when the White Ship sank off Harfleur on the 25 November 1120 drowning his only legitimate son – another William. This meant that William Clito became a logical successor to his uncle. He was, after all, the legitimate son of the Conqueror’s eldest son.
In addition to the change in Clito’s perceived status Henry I also refused to return the dowry that had come with Matilda of Anjou upon her betrothal to his son. Matilda’s father, Fulk V Count of Anjou now betrothed his daughter Sybilla to William Clito and gave him as Sybilla’s dowry the county Maine- an area between Anjou and Normandy. Henry I appealed to the pope and the marriage was ultimately annulled in 1124 because the pair were too closely related.
Meanwhile the Normans had rebelled against Henry for a second time in 1123-1124.
And so it continued, with the French king taking the opportunity to add to Henry I’s discomfort by providing men and money for William in 1127. It was at this point that William married the french queen’s (Adelaide of Maurienne) half sister Joan of Montferrat. Louis VI was using William as a pawn against Henry’s claim to Maine.
On the 12 July 1128 William was at the Siege of Aaist. He was wounded in the arm. The wound became gangrenous. He died on 28th July. Amongst his followers was his brother-in-law Hélias of Saint-Saëns, Count of Arques who had been at his side for most of his life.
It is perhaps not surprising that there is no portrait of William – his uncle Henry I made a rebel of him and did not want him to inherit either Normandy or England after the death of his own son (also William). Clito’s father, Robert Curthose, survived him by five and a half years.
Weir, Alison. Britain’s Royal Families: the Complete Genealogy
