special province by Diocletian, with the capital at Naissus. In Roman times the eastern part of Dardania, from Scupi to Naissus, remained inhabited mostly by a local population, mainly from Thracian origin. The city population was very diverse. Engravings on tombstones suggest that only a minority of the population came from Italy, while many veterans were from Dalmatia, South Gaul and Syria. Because of the ethnic diversity of the population, Latin maintained itself as the main language in the city at the expense of Greek, which was spoken in most of the Moesian and Macedonian cities. During the following centuries, Scupi experienced prosperity. The period from the end of the 3rd century to the end of the 4th century was particularly flourishing. A first church was founded under the reign of Constantine the Great and Scupi became the seat of a diocese. In 395, following the division of the Roman Empire in two, Scupi became part of the Eastern Roman Empire. An ancient funeral inscription of the Illyrian tribe Albanoi was found in Scupi. In its heyday, Scupi covered 40 hectares and was closed by a wide wall. It had many monuments, including four necropoles, a theatre, thermae, and a large Christian basilica. Middle Ages In 518, Scupi was destroyed by a violent earthquake, possibly the most devastating the town had ever experienced. At that time, the region was threatened by the Barbarian invasions, and the city inhabitants had already fled in forests and mountains before the disaster occurred. The city was eventually rebuilt by Justinian I. During his reign, many Byzantine towns were relocated on hills and other easily defendable places to face invasions. It was thus transferred on another site: the promontory on which the fortress stands. However, Scupi was sacked by Slavs at the end of the 6th century and the city seems to have fallen under Slavic rule in 595. The Slavic tribe which sacked Scupi were probably the Berziti, who had invaded the entire Vardar valley. However the Slavs did not settle permanently in the region that had been already plundered and depopulated, but continued south to the Mediterranean coast. After the Slavic invasion it was deserted for some time and is not mentioned during the following centuries. Perhaps in the late 7th or the early 8th century the Byzantines again settled at this strategic location. Along with the rest of Upper Vardar valley it