Carlos, Don, son of Philip II. of Spain, born at Valladolid, and heir to the throne, but from incapacity, or worse, excluded by his father from all share in the government; confessed to a priest a design to assassinate some one, believed to be his father; was seized, tried, and convicted, though sentence against him was never pronounced; died shortly after; the story of Don Carlos has formed the subject of tragedies, especially one by Schiller, the German poet (1545‒1568).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Carloman * Carlos, Don