 John Stewart, Earl of Mar was the youngest son of an unpopular and ineffective what?
John Stewart, Earl of Mar (d. 1503): John Stewart, Earl of Mar (December 1479 – 11 March 1503) was the youngest son of James III of Scotland and Margaret of Denmark. 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