OSTIA

modern Ostia Antica Italy, ancient Roman town originally at the mouth of the Tiber but now about 4 miles (6 km) upstream; the modern seaside resort is about 3 miles (5 km) southwest of the ancient city. Ostia was a port of republican Rome and a commercial centre under the empire (after 27 BC). The Romans considered Ostia their first colony and attributed its founding (for the purpose of salt production) to their fourth king, Ancus Marcius (7th century BC). Archaeologists have found on the site a fort of the mid-4th century BC, but nothing older. The purpose of the fort was to protect the coastline, the first of the long series of Rome's maritime colonies. When Rome developed a navy Ostia became a naval station, and during the Punic Wars (264201 BC) it served as the main fleet base on the west coast of Italy. It was the major portespecially significant in grain tradefor republican Rome until its harbour, partly obstructed by a sandbar, became inadequate for large vessels. During the empire Ostia was a commercial and storage centre for Rome's grain supplies and a service station for vessels going to Portus. New baths, temples, and warehouses were built to support the prospering community. At the height of Ostia's prosperity in the early 2nd century AD, its population was approximately 50,000. The growing population was accommodated by means of tall brick apartment buildings of three, four, and five stories. The floors in these buildings were paved with mosaic, and the walls elaborately (and sometimes skillfully) painted; the larger flats had up to 12 rooms. The growth in wealth raised the standard of public generosity of leading citizens. Public funds were restricted, but magistrates were expected to show their appreciation of honours in a practical way; it was they who provided most of the sculpture that adorned the public buildings and public places and who built most of the temples. Ostia also was sufficiently vital to Rome to expect the attention of emperors. Its three largest sets of public baths were owed to imperial generosity. Little new building occurred after the end of the 2nd century. Ostia suffered from the decline of the Roman economy beginning in the 3rd century and from barbarian raids of the 5th and following centuries. It was abandoned after the erection of Gregoriopolis, site of Ostia Antica, by Pope Gregory IV (827844). The Roman ruins were quarried for building materials in the Middle Ages and for sculptors' marble in the Renaissance. Archaeological excavation was begun in the 19th century under papal authority, and about two-thirds of the Roman town can now be seen.