Ancus Marcius (r. 640 BC – 616 BC) was the legendary fourth of the Kings of Rome. He was the son of Marcius (whose father, also named Marcius, had been a close friend of Numa Pompilius) and Pompilia (daughter of Numa Pompilius). According to Festus, Marcius had the surname of Ancus from his crooked arm.
Upon the death of the previous king, Tullus Hostilius, the Roman Senate appointed an interrex, who in turn called a session of the assembly of the people who elected the new king.
According to Livy, his first act as king was to order the pontifex maximus to copy the text concerning the performance of public ceremonies of religion from the commentaries of Numa Pompilius to be displayed to the public, so that the rites of religion should no longer be neglected or improperly performed.
He waged war successfully against the Latins, and a number of them were settled on the Aventine Hill.
According to Livy the war was commenced by the Latins who anticipated Ancus would follow the pious pursuit of peace adopted by his grandfather, Numa Pompilius. The Latins initially made an incursion on Roman lands. When a Roman embassy sought restitution for the damage, the Latins gave a contemptuous reply. Ancus accordingly declared war on the Latins. The declaration is notable since, according to Livy, it was the first time that the Romans had declared war by means of the rites of the fetials.
Ancus Marcius marched from Rome with a newly levied army and took the Latin town of Politorium (situated near the town of Lanuvium) by storm. Its residents were removed to settle on the Aventine Hill in Rome as new citizens, following the Roman traditions from wars with the Sabines and Albans. When the other Latins subsequently occupied the empty town of Politorium, Ancus took the town again and demolished it. The Latin villages of Tellenae and Ficana were also sacked and demolished.
The war then focused on the Latin town of Medullia. The town had a strong garrison and was well fortified. Several engagements took place outside the town and the Romans were eventually victorious. Ancus returned to Rome with much booty. More Latins were brought to Rome as citizens and were settled at the foot of the Aventine near the Palatine Hill, by the temple of Murcia
Ancus Marcius incorporated the Janiculum into the city, fortifying it with a wall and connecting it with the city by a wooden bridge across the Tiber, the Pons Sublicius. On the land side of the city he constructed the Fossa Quiritium, a ditch fortification. He also built Rome's first prison, the Mamertine prison.
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