The Roman port of Ostia was located at the mouth of the Tiber River in Italy. It was founded by Ancus Marcius in the 7th century BC and served as the main port of Rome for centuries. Ostia was a major trading hub for the Roman Empire, with goods from all over the Mediterranean arriving there. It was also an important military base, with a large garrison stationed there to protect the city. In the 4th century AD, Ostia was abandoned due to silting of the harbor, but it remains an important archaeological site today.