William FitzAlan; feudal Baron of Oswestry, Sheriff Salop and Castellan of Shrewsbury 1138; besieged there as an adherent of the Empress Maud by King Stephen; restored to his lands by Henry II 1155 and set about recovering the Barony of Oswestry, by now in Welsh hands; founder of Haughmond Abbey; m. 1st Christian, possibly a niece of Robert FitzRoy, 1st Earl of Goucester of the 1122 cr., illegitimate son of Henry I, and had a daughter (Christian, m Hugh Pantulf); m 2nd Isabel....daughter and heir of Ingram de Say, feudal Lord of Clun, Salop and d. 1160. [Burke's Peerage]
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William FitzAlan, in the contest between King Stephen and the Empress Maud, being then governor of Shrewsbury and sheriff of the county of Salop, held the castle of Shrewsbury for the latter until it was taken by assault. He was also with the empress at the siege of Winchester Castle in the 6th Stephen [1141], when she and her whole army were put to flight; and afterwards, continuing to adhere stoutly to the same cause, he was reconstituted sheriff of Salop so soon as King Henry attained the crown. This William m. Isabel, dau. and heir of Helias de Say, Lady of Clun, niece of Robert, Earl of Gloucester, and dying some time before 1160, was s. by his son, William FitzAlan. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 200, Fitz-Alan, Earls of Arundel, Barons Maltravers]