Alexander I, 1078?-1124, king of Scotland (1107-24), son of Malcolm III and St. Margaret of Scotland. He succeeded his brother Edgar, who had divided the kingdom so that Alexander ruled only N of the Forth and Clyde rivers, while his brother David ruled in the south. Early in his reign he decisively quelled an uprising in N Scotland. Like his mother, Alexander encouraged ecclesiastical conformity with English ways and established several monasteries, including the abbeys at Inchcolm and Scone. David succeeded him as David I.