Not to butt in but I saw your post and I check Ancestry as well. Most have this information. May want to as about place of birth and death as well as his mother. There seems to be no "valid" documentation as to who she was.
Henry De Grey
Birth: 1155 - Essex, England
Death: 1219 - Codnor, Derbyshire, England
Marriage: 1199 - Essex, England
Spouse: Isolda De Bardolph
F: Richard De Grey
M: (Name Unknown