Roman city Pietas Julia (now Croatian Pula) was a thriving urban center. Trade contributed to this, especially because the settlement was erected (even before the arrival of the Romans), on the bay which is an excellent natural port. It was precisely thanks to the economic importance of the Romanum Pietas Julia that it developed, which also resulted in the construction of more and more impressive public buildings, such as temples, baths and cultural facilities. By far the most impressive object, including civitas, was the amphitheater in Pula.