Ostia, the harbor city of ancient Rome, has long drawn the attention of Roman archaeologists. Ostia is one of the most extensively excavated and well-preserved cities in the Roman West, and, as such, has long played an important role in our understanding of urban infrastructure and daily life. For many decades, archaeological work at Ostia has been focused toward the city’s Early Republican and Imperial-period history, overlooking the site’s rich Late Antique archaeology and development.