Cesare Borgia (; Catalan: Cèsar Borja, ; , ; 13 September 1475 or April 1476 – 12 March 1507), Duke of Valentinois, was an Italian condottiero, nobleman, politician, and cardinal, whose fight for power was a major inspiration for The Prince by Machiavelli. He was the illegitimate son of Pope Alexander VI (r. 1492–1503) and his long-term mistress Vannozza dei Cattanei. He was the brother of Lucrezia Borgia; Giovanni Borgia (Juan), Duke of Gandia; and Gioffre Borgia (Jofré in Catalan), Prince of Squillace. He was half-brother to Don Pedro Luis de Borja (1460–88) and Girolama de Borja, children of unknown mothers.