William FitzAlan Baron of Oswestry  24,25
- Born: Bet 1105 and 1110, Oswestry, Shropshire, England
- Marriage (1): Christian FitzRobert  about 1135
- Marriage (2): Isabela de Say 
- Died: Bet 1166 and 1177
Another name for William was 1st Great Steward of Scotland.
in the contest between Stephen and the Empress Maud, being then Governor of Shrewsbury and Sheriff of the county of Salop, held the castle at 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 year of Stephen, when she and her whole army were put to flight; afterwards, continuing to adhere stoutly to the same cause, he was reconstituted Sheriff of Salop, when King Henry attained the crown. In the 12th year of Henry II, upon the assessment, in aid of marrying the King's daughter, certified his knight's fees to be in number thirty-five and a half.
http://www.tudorplace.com.ar/FITZALAN.htm#William FITZALAN (B. Oswestry)
The Complete Peerage vol.V,pp.391-392.
William married Christian FitzRobert  [MRIN: 1083], daughter of Robert of Gloucester de Mellent de Caen 1st Earl of Gloucester  and Mabel FitzHamon , about 1135. (Christian FitzRobert  was born about 1118 in Bristol, Gloucestershire, England.)
William next married Isabela de Say  [MRIN: 1085], daughter of Ellis de Say Lord of Clun  and Unknown. (Isabela de Say  was born about 1110.)