The Leagues failed to develop from an alliance to a lasting confederation and subsequently, among the various local city-states, a process of consolidation took place; most of them became lordships ruled by powerful families like the Della Scala of Verona or the Visconti of Milan, and conquered neighboring cities threatening to unify Northern Italy under a single state. the end a balance of power was reached in 1454 with the Peace of Lodi and Northern Italy ended up divided between a small number of regional states, the most powerful were the Duchies of Savoy, Milan, Mantua, Ferrara and the Republics of Genoa and Venice, which had begun to extend its influence in the mainland from the 14th century onwards.