King of Scotland from 1437 to 1460, son of preceding; during his minority the country was torn by rival factions amongst the nobility, the chief point of contest being the wardship of the young king; an attempt on the part of the conspirators who had murdered James I. to place their leader, the Earl of Athole, on the throne, was frustrated; in 1449 James assumed the duties of his kingship, and in the same year married Mary, the daughter of the Duke of Gueldres; an English war then being waged on the Borders was brought to a close, and the young king entered vigorously upon administrative reforms; in these efforts he was hampered by the opposition of the nobility, and his fiery temper led him to participate in the murder of the chief obstructionist, the Earl of Douglas; protection given to the exiled Douglases by the Yorkists led James to support the claims of Henry VI. in England; he was killed by the bursting of a cannon at the siege of Roxburgh Castle (1430-1460).