As says in the title. IOTL Henry I lived only seven years more than his nephew William Clito, who claimed the Norman inheritance in Normandy and England as the son of Robert Curthouse, eldest son of William the Conqueror. But Clito died in 1128 from a battle wound that became grangrenous. Assuming he didn't get hurt in that battle:
a) How successful William could be in getting Flanders and other territories?
b) What would happen to the English succession, now with three contenders for the throne (Matilda, Stephen and William)?
a) How successful William could be in getting Flanders and other territories?
b) What would happen to the English succession, now with three contenders for the throne (Matilda, Stephen and William)?