Some articles on fitzallan:

Clan Wallace - History - Origins of The Clan
... Among them was Walter Fitzallan, who the Scottish king appointed his Steward in 1136 ... One of Fitzallan's followers was Richard Wallace from Oswestry who came north to try and improve his fortunes ... Lord Fitzallan received from King David lands in Ayrshire and so it was here that his follower Richard Wallace settled ...