Richard III of England (d. 1485) December 6 – Antonio Mancinelli, Italian humanist pedagogue and grammarian (d. 1505) December 10 – Johannes Stöffler, German mathematician (d. 1531) Date unknown Diogo Cão, Portuguese explorer (d. 1486) Lucrezia Crivelli, mistress of Ludovico Sforza of Milan (d. 1508) (approximate date) Deaths February 10 Švitrigaila, Grand Prince of Lithuania Michał Bolesław Zygmuntowicz (Michael Žygimantaitis), Prince of Black Ruthenia February 14 – Konrad VII the White, Duke of Oleśnica February 22 – William Douglas, 8th Earl of Douglas (b. 1425) April 20 – Reinhard III, Count of Hanau (1451–1452) (b. 1412) May – John Stafford, Archbishop of Canterbury October – Nicholas Close, English bishop probable – Gemistus Pletho, Greek philosopher References