Roman Salona, the former metropolis of the Roman province, is located to the north of Split in today’s Solin. It was the port and stronghold of Illyrian Dalmatians (Dalmati). The town core was trapezoid in shape, surrounded by walls and towers, some parts of which are from the 2nd century BC. Sudden development of the town started at the time of Augustus and continued throughout the whole 1st century when they built the Forum with the Capitol and a theatre. The town extends and takes on an ellipsoid shape. At the time there are around 62 000 inhabitants. The size of the town is substantiated by the remains of the arena where bloody fights of gladiators and beasts took place. It could hold to 19 000 spectators. A large number of private and public thermal spas were discovered in Salona. The best preserved are the Great Town Thermae from the end of the 2nd century. A significant period in the town’s development was the reign of Emperor Diocletian who built a magnificent palace not far from Salona (in today’s Split) where he retreated after his abdication in 305. The last three centuries of the old Salona’s life are characterised by the development of a strong Christian community in the town and its influence on the entire region, and the Bishop of Salona becomes the metropolit of the whole Dalmatian Province.