Marriage (1): Sybilla D.Of GODFREY COUNT OF CONVERSANO 
Died: 1134, Cardiff Castle at age 83
Robert, the oldest son of William the Conqueror, was bequeathed Normandy at his father's death. He tried to take England from his younger brother, Henry I, but was captured by him at Tenchebrai. Henry imprisoned him for the last 29 years of his life in Cardiff Castle. (Usherwood, Reign by Reign)
Robert married Sybilla D.Of GODFREY COUNT OF CONVERSANO  [MRIN: 1085].
Stephen Usherwood, Reign by Reign (Michael Joseph Pub.). 1
David Piper, Kings and Queens of England and Scotland with copies of pages provided to me by Pat Moran of Texas. 1