 John Stewart, Earl of Mar was the youngest son of an unpopular and ineffective what?
James III of Scotland: James III (10 July 1451/May 1452 – 11 June 1488) was King of Scots from 1460 to 1488. James III of Scotland:  James was an unpopular and ineffective monarch owing to an unwillingness to administer justice fairly, a policy of pursuing alliance with the Kingdom of England, and a disastrous relationship with nearly all his extended family.
i don't know