This unfortunate princess had been happily married to Thomas, Master of Boyd, "the most courteous, gentlest, wisest, kindest, most bounteous knight" and "fairest archer, devoutest, most perfect, and truest to his lady". The King made him Earl of Arran, giving them the island of Arran for her dowry. But his father, the Regent Boyd, suddenly fell from power in 1469 and the family fled into exile in Burgundy. 
After her beloved husband's death, the princess returned to Scotland where the king gave her hand in marriage to Lord Hamilton, then an elderly widower. In 1484, after the murder by the Montgomeries of the young 2nd Lord Boyd, her son by her first marriage, her heir became James, 2nd Lord Hamilton, the son on her second marriage. This was of immense importance to Scottish history, as throughout the sixteenth and seventeenth centuries the Hamilton chiefs were often the nearest heirs presumptive to the throne. 

Source: Leo van de Pas