ANCUS MARCIUS, the fourth king of the Romans, succeeded Tullus Hostilius 640 years before Christ. He defeated the Latins, subdued the Fidenates, conquered the Sabines, Volsci, and Veientes, enlarged Rome by joining to it Mount Janiculum, and made the harbour of Ostia. He died about 617 years before the Christian era. In his reign many of the conquered Latins were incorporated with the Roman state, and not receiving the full franchise, formed the first elements of the Roman plebs.