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James Stewart, the Black Knight of Lorne (c.1399-c.1451) was a Scottish nobleman.
The Black Knight of Lorne was born at Innermeath, Scotland. His father was Sir John Stewart (died 26 April 1421), Scotland's Ambassador to England. He was a direct male line descendant of Alexander Stewart, 4th High Steward of Scotland, through his second son Sir John Stewart of Bonkill, who was killed at the Battle of Falkirk. His mother was also a descendant of Elizabeth de Burgh, second wife/Queen Consort of King Robert I ("The Bruce").
James was a younger brother of Robert Stewart, 1st Lord Lorne (1382-1449), whose descendants bore this title. He was an ally of the Black Douglases, Earls of Douglas. After the murder of James I of Scotland in 1437, power was held by Archibald Douglas, 5th Earl of Douglas as regent for the underage James II of Scotland. The Stewarts of Lorne were amongst his most trusted supporters, and their power greatly increased while the Douglas family controlled Scotland and the king was a mere 7 years of age. However the unexpected death of the 5th Earl of Douglas from a fever in 1439 saw power now being uneasily shared between William, 1st Lord Crichton, Chancellor of Scotland and Sir Alexander Livingston, Governor of Stirling Castle.
Stewart married Joan Beaufort, the Queen Consort, and became stepfather to James II. Stewart and his Douglas allies planned to remove the young James II, who was being held by Livingston in his stronghold of Stirling Castle. However, Livingston arrested Lady Joan on 3 Aug 1439, imprisoning her in Stirling Castle, while throwing Sir James and his brother Sir William into its dungeon. They were later released on good behaviour. Stewart was given safe conduct to England in 1445, 1447, and 1451. He was supposedly captured at sea by Flemish pirates and put to death after 1451. But he was still alive in 1453-54 when he carried King James II's offer to Edmund Beaufort, Duke of Somerset to rescue him. Somerset was then a prisoner in the Tower of London while Richard Duke of York was in charge of the government.
He married, before 21 September 1439, Joan Beaufort, Queen of Scots, Queen Consort of Scotland and widow of James I of Scotland. They had a papal dispensation for both consanguinity and affinity. She was a daughter of John Beaufort, 1st Earl of Somerset (son of Katherine Swynford and John of Gaunt, and a grandson of Edward III of England) by his wife Lady Margaret Holland, daughter of Thomas Holland, 2nd Earl of Kent and Alice FitzAlan.
James Stewart and Joan Beaufort had three children: