1911 Encyclopædia Britannica/John II. of Portugal

JOHN II. (1455–1495), the Perfect, king of Portugal, succeeded his father, Alphonso V., in August 1481. His first business was to curtail the overgrown power of his aristocracy; noteworthy incidents in the contest were the execution (1483) of the duke of Braganza for correspondence with Castile, and the murder, by the king’s own hand, of the youthful duke of Viseu for conspiracy. This reign was signalized by Bartholomeu Diaz’s discovery of the Cape of Good Hope in 1488. Maritime rivalry led to disputes between Portugal and Castile until their claims were adjusted by the famous treaty of Tordesillas (June 7, 1494). John II. died, without leaving male issue, in October 1495, and was succeeded by his brother-in-law Emmanuel (Manoel) I.

See J. P. Oliveira Martins, O principe perfeito (Lisbon, 1895).