The city of Rome was built on 7 hills beside the Tiber River, protected by the hills and nourished by the river's soil. In the early years, Rome was influenced by the Etruscans, Greeks, and Latins who settled the region. Rome transitioned to a republic in 509 BCE, governed by elected officials like consuls and dictators, as well as the Senate and Tribal Assembly, though patricians initially held most political power over plebeians.