Ancus Marchs, the fourth king of Rome, said to have been the grandson of Numa, and to have reigned from 640 to 616 B. C. He revived the religious ceremonies which his grandfather had established, but which had fallen into desuetude. He waged successful wars against the Latins, took many of their cities, and transported their inhabitants to Rome. He founded a colony at Ostia, erected a fortress on the Janiculum, and caused several other works to be constructed, which added to the strength and security of his capital.