The Arena was built between 27 BC and 68 AD,[1] as the city of Pula became a regional centre of Roman rule, called Pietas Julia. The building is named after the sand (Latin harena) that once covered the inner, performance area. It was built outside the town walls along the Via Flavia, the road from Pula to Aquileia and Rome.[2]

The amphitheatre was first built in timber during the reign of Augustus (2–14 AD). It was replaced by a small stone amphitheatre during the reign of emperor Claudius. In 79 AD it was enlarged to accommodate gladiator fights by Vespasian and to be completed in 81 AD under emperor Titus. This was confirmed by the discovery of a Vespasian coin in the malting.[2]

St. Germanus, of whom little is known, was allegedly tortured in the Amphitheatre in or around 290, and subsequently martyred outside the city, on the road to Nesactium. The legend is apocryphal. The amphitheatre remained in use until the 5th century, when emperor Honorius prohibited gladiatorial combats. It was not until 681 that combat between convicts, particularly those sentenced to death, and wild animals was forbidden. In the 5th century the amphitheatre began to see its stone plundered by the local populace. By the 13th century, the patriarch of Aquileia forbade further removal from the Arena.[2]