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In page Antioch:

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One of the most famous Roman additions to the city was its hippodrome, the Circus of Antioch. This chariot racing venue was probably built in the reign of Augustus, when the city had more than half a million inhabitants; it was modelled on the Circus Maximus in Rome and other circus buildings throughout the empire. Measuring more than 490 metres (1,610 feet) in length and 30 metres (98 feet) of width,[3] the Circus could house up to 80,000 spectators.[citation needed] The most important building though was the Imperial Palace.[4] It housed the roman emperor on occasion and may have originally been the seleucid palace. According to Libanius, at his time the palace won in any comparison of its size and was unsurpassed in beauty.[4]