Ivo comté de Beaumont-sur-Oise
Information about this person:
• Background Information. 201
"The noble Hugh de Grantmesnil was in his youth distinguished for his valour, and married a very geautiful lady, Adeliza, daughter of Ivo, count de Beaumont, by whom he had Robert, William, Hugh, Ivo, and Aubrey; Adeline, Havise, Rohais, Matilda, and Agnes. This large and promising family was prey to various misfortunes, so that none of them except Robert lived to an old age."
~ The Ecclesiastical History of England and Normandy, Vol. II, p. 505
From footnote (2), p. 507, Ivo also had a son named Matthew, comté de Beaumont-sur-Oise, who was chamberlain of France in 1139, and died in 1151/2
Ivo married Judith.