Sheriff of Shropshire under Henry I of England (letter from Philip B. Stewart, 6 Sabal St., Sewall's Pt. Stuart, Fl., 4/24/1990). aka Alan FitzFlaald (Bingham, Caroline. The Stewart kingdom of Scotland : 1371-1603. NY : St. Martin's Press, c1974, appendix).
Alan obtained soon after the Norman conquest a grant of the castle of Oswestry (Ostvestrie)(WWW site: Directory of royal genealogy). He was of Norman origin. Castle was on the Welsh border. (www.electricscotland.com - Clan Stewart).