Mowbray is an Anglo-Norman baronial house, derived from Montbray (Manche) in Normandy south of St Lo. The heraldic badge of the house was a mulberry tree. It was founded at the Conquest by Geoffrey de Montbray, bishop of Coutances. His brother's son Robert de Montbray, who rebelled with him against William Rufus on the Conqueror's death, was made, after their reconciliation, earl of Northumbria, as his uncle's heir but was forfeited and imprisoned for life on rebelling again in 1095.… (More on Mowbray)