Due to the excellent climatic conditions and the medicinal mineral waters (22 springs), the site of the present Diocletianopolis has been inhabited since the 6th millennium BC. Later on, a Thracian settlement was found there, which after the Roman conquest of Thrace (around the 1st c. ) expanded and developed as typical Roman town. During the 3rd c. the Roman Emperor Diocletian settled there because of the curative effect of the mineral waters and gave the name of the town –…