sentences:  According to the 6th century "Synecdemus", it belonged to the province of Macedonia Prima, although the 10th century "De thematibus" claims that it was part of Thracia.The island was a major source of marble until the disruption of the Slavic invasions in the late 6th/7th centuries, and several churches from Late Antiquity have been found on it.The island remained in Byzantine hands for most of the Middle Ages.