Comte De Guisnes Gallus Guillaume De Vere Comte De Guisnes

Gallus Guillaume's father was Comte De Guisnes Amelius De Vere Comte De Guisnes and his mother was Helene De Blois.  His paternal grandparents were Comte De Guisnes Otho De Vere Comte De Guisnes and Constance De Chartres.  He was an only child.

They had a son named Manasses.