The Pula Arena is the name of the amphitheatre located in Pula, Croatia. The Arena is the only remaining Roman amphitheatre to have four side towers and with all three Roman architectural orders entirely preserved. It is among the six largest surviving Roman arenas in the World. A rare example among the 200 Roman surviving amphitheatres, it is also the best preserved ancient monument in Croatia. The amphitheatre is depicted on the reverse of the Croatian 10 kuna banknote, issued in 1993, 1995, 2001 and 2004. The Arena was built between 27 BC 68 AD, as the city of Pula became a regional centre of Roman rule, called Pietas Julia. The name was derived from the sand that, since antiquity, covered the inner space. It was built outside the town walls along the Via Flavia, the road from Pula to Aquileia and Rome. The amphitheatre was first built in timber during the reign of Augustus (214 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. A Christian called Germanus was martyred in the arena in the 4th century. The amphitheatre remained in use until the 5th century, when emperor Honorius prohibited gladiatorial combats. But was 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.