Robert III., king of Scotland from 1390 to 1406, son of Robert II.; was a quite incompetent ruler, and during his reign the barons acquired an ascendency and displayed a disloyalty which greatly diminished the power of the Crown both in his and succeeding reigns; the government fell largely into the hands of the king's brother, the turbulent and ambitious Robert, Duke of Albany; an invasion (1400) by Henry IV. of England and a retaliatory expedition under Archibald Douglas, which ended in the crushing defeat of Homildon Hill (1402), are the chief events of the reign (1340‒1406).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Robert II. * Robert the Devil