Ancient Rome began as villages along the Tiber River that united in 750 BC to form the city of Rome. For over 200 years, kings ruled Rome before it became a republic in 509 BC governed by the powerful Roman Senate. Under ambitious generals, Rome's army expanded the republic's territory around the Mediterranean Sea. Roman civilization was supported by advanced architecture like aqueducts and arches, public baths, theaters, and the Colosseum arena. Citizens enjoyed sports, entertainment, and social activities while families, social classes, and country life were defined by hierarchy and economic status.