Alexander II of Scotland

Alexander II (Medieval Gaelic: Alaxandair mac Uilleim; Modern Gaelic: Alasdair mac Uilleim) (1198–1249) was King of Scotland from 1214 until his death. He was the son of William the Lion and Ermengarde de Beaumont, succeeding to the throne at the age of sixteen. He ruled for thirty-five years, during which time he began consolidating the Scottish kingdom. Alexander's early reign was marked by conflict with John of England and his involvement in the First Barons' War. He supported the rebel English barons and campaigned mainly in northern England. Following John's death in 1216, Alexander made peace with John's son and successor, Henry III of England, taking a more diplomatic approach between the two kingdoms. This was strengthened by his marriage in 1221 to Joan of England.

Within Scotland, Alexander worked to reinforce his authority across a politically unconsolidated Kingdom. He eliminated repeated rebellions in Ross and Moray in the north, and in Galloway in the southwest, including the final destruction of the MacWilliam line. He extended royal control into regions where his predecessors could only exercise limited influence. Alexander extended his interventions on the western seaboard, confronting Norse-influenced lords in Argyll and the Hebrides. His dealings with England remained central to his rule. In 1237, he concluded the Treaty of York with Henry III, which settled border issues and defined the Anglo-Scottish border in largely enduring terms.