an old Florentine family, originally from Arezzo. Beginning in 1210 the members of this family held high government positions in Florence. The Albizzis belonged to the Lana guild and played a prominent role in the Guelph Party. During the Ciompi revolt of 1378 the Albizzi house was burned and the Albizzis themselves fled from the city. Maso degli Albizzi (1347–1417) beginning in 1382 and his son Rinaldo degli Albizzi (1370–1442) beginning in 1417 virtually headed the oligarchical government of Florence, competing with the Medici family. In 1434, Cosimo de’ Medici seized power, and the Albizzis were banished from Florence.