Albizzi, Rinaldo degli (1370–1442)

Italian political figure and soldier, unofficial ruler of Florence 1417–34. A leading member of the Albizzi family, which dominated the government of Florence after the revolt of the Ciompi in 1378, he came to power when his father, Maso degli Albizzi, died in 1417. He organized an unpopular and unsuccessful expedition against Lucca 1429–33, and exiled his main opponent, Cosimo de' Medici, in 1433. He himself was exiled when Cosimo returned in 1434.