Rome was founded as a republic in 509 BCE, with a government led by senators and two annually elected consuls. Romans were polytheistic and adopted Greek gods like Jupiter and Juno. Society was divided into patricians and plebeians. The Roman Republic expanded across Italy and conquered territories through a powerful army composed of citizen-soldiers. After a period of instability, Augustus established the Roman Empire, bringing two centuries of peace and prosperity under imperial rule. However, the western empire eventually declined due to invasions, economic troubles, and governmental corruption.