About Gilbert 'the Constable' de Montgomery
Gilbert de Montgomerie
Parents: Roger I de Montgomerie & Josceline
Unmarried, no known children
GILBERT de Montgommery (-murdered ). Guillaume de Jumièges names (in order) "Hugues, Robert, Roger, Guillaume et Gilbert" as the five sons of Roger de Montgommery, commenting that they remained in Normandy after their father was exiled "se livrant à toutes sortes de crimes".
Brother of Roger de Montgommery according to Orderic Vitalis, who recorded that he was poisoned by Mabile de Bellême his brother's wife.
Died by the hands of his sister n law Mable . She poisoned a drink intending on someone else to take it and he instead took the drink and died.