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Lonely Planet review for Portico d’Ottavia
To the east of the Ghetto is the archaeological area of the Portico d’Ottavia, the oldest quadriporto (four-sided porch) in Rome. The columns and fragmented pediment once formed part of a vast rectangular portico, supported by 300 columns, that measured 132m by 119m. Erected by a builder called Octavius in 146 BC, it was rebuilt in 23 BC by Augustus, who kept the name in honour of his sister Octavia. From the Middle Ages until the late 19th century, the portico housed the city’s fish market.