Confederation of roughly 30 Latin city-states (including Tusculum, Aricia, Lanuvium, Lavinium, Tibur, and Ardea) formed for mutual defense, originally led by Alba Longa and later dominated by Rome.
Rome's tightening control under the renewed 358 BCE treaty triggered the Latin War (343-338 BCE); after Rome's victory the League was dissolved and member cities were reorganized as Roman municipalities and colonies.
Standard modern account of early Latium, the Latin League, and Rome's rise to dominance over it.