From the 11th century onwards, many Italian towns achieved independence as political entities, unhindered by any centralising power. Until the late 13th century, when the regimes of individual “tyrants” took over in most towns, these communes were the scene of a precocious, and very well-documented, experiment in republican self-government. The authors draw on a rich variety of contemporary material, both documentary and literary, to portray the world of the republican regimes, focusing on the public spirit and factional strife that was to tear them apart. Discussion of the artistic and social lives of the inhabitants shows how these towns were the seedbeds of the cultural achievements of the early Renaissance.