The 3rd High Steward, 1204 till 1246. First to adopt the Stewart spelling for his surname. Justiciary of Scotland under King Alexander II. Founded Cross Raguel Abbey (letter from Philip B. Stewart, 6 Sabal Ct., Sewall's Pt., Stuart, Fl., 4/24/1990).
Concise dictionary of national biography, part 1 : from the beginnnings till 1900. London : Oxford University Press, 1969, pg. 1251 claims Walter Stewart (d. 1177) first to use Stewart surname.
Browning, Charles H. Americans of royal descent, 7th ed., 1986, pg. 261 lists him as 5th High Steward.