The Albizzi family was a Florentine family based in Arezzo and rivals of the Medici and Alberti families. They were the centre of Florence oligarchy from 1382, following the Ciompi revolt, to the rise of the Medici in 1434. The most infamous and influential members of the family were Maso and his son Rinaldo (1370–1442) who countered the rise of Cosimo de' Medici, exiling him in 1433.