William de Albini, feudal Lord of Belvoir, like his father, adheredfirmly to King Henry III. He m. 1st, Albreda, dau. of Henry Lord Biseth,and 2ndly, Isabel-----, and left issue by the former, an only dau. andheiress, Isabel de Albini, who m. Robert de Ros, Lord Ros of Hamlake, andconveyed to him the feudal barony and castle of Belvoir, which eventuallypassed from the family of Ros to that of Manners. [Sir Bernard Burke,Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd.,London, England, 1883, p. 160, Daubeney, Barons Daubeney, Earl ofBridgewater]
Note: Magna Charta Sureties states that Isabel was daughter of his 2ndwife Isabel.