1. 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 Germanpoet (1545-1568).
2. carlos, don the brother of FerdinandVII. of Spain, on whose death he laid claim to the crown as heir, against Isabella, Ferdinand's daughter who by the Salic law, though set aside in her favour by her father, had, he urged, no right to the throne; his cause was taken up by a large party, and the struggle kept up for years; defeated at length he retired from the contest, and abdicated in favour of his son (1785-1855). Carlos, Don