The second king, named Numa Pompilius, was said to be of Sabine origin. He built the king’s palace in the Forum (Regia) and organized the religion of Rome including the Temple of Vesta and its servants, the Vestal Virgins. Numa also expanded the Roman calendar to twelve months. He reigned for forty three years and then passed from this life.
Next was Tullus Hostilus, a strong military leader whose most notable achievement was the defeat of the Albans which led to their annexation to Rome. Tullus also built the first Senate house and called it the Curia Hostilia. He died in 642 B.C. after a reign of thirty one years.
The fourth king was Ancus Marcius. He is credited with building the first bridge across the Tiber and with extending Roman influence to Ostia. He lost a popular election in 616 B.C. to L. Tarquinius Priscus.