They married with the permission of Pope Paschall, as her husband, Robert de Mowbray, Earl of Northumberland, was still alive, though in prison for rebellion against William Rufus. [1]
[S11] Burke, Bernard. A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire , (London: Harrision, 1866).