Walter Stewart, Earl of Atholl

Walter Stewart, Earl of Atholl, Strathearn and Caithness (c. 1360 – 26 March 1437) was a Scottish nobleman, the son of Robert II of Scotland.

The chronicler Buchanan (1582) saw in his efforts to return James to Scotland and support him against Albany and his children a deep-laid plan for those two branches of the House of Stewart to destroy each other – and clear his own way to the throne, reviving the old charge of illegitimacy against his half-brother Robert III.

Robert Stewart unbarred the doors to the royal apartments, permitting assassins to enter the King's lodging at the Dominican Blackfriars in Perth.

The King hid under the floorboards, only to be discovered by Sir Robert Graham, who personally murdered the monarch.

They were attainted and put to death in Edinburgh by a series of tortures remarkable and hideous even for that era.