And in 2018 the population was 1[1] The prehistoric settlement of Kastri is situated in the mountainous hinterland of Thasos, between the villages of Theologos and Potos.
[2] Similar pottery has also been found at Paradeisos (archaeological site) in the region of Eastern Macedonia and Thrace in Northern Greece.
The settlement was first mentioned in 1434 in connection with the establishment of a local fortress or citadel (acropolis) by Umberto Grimaldi, when Thassos was ruled by the Genoese Dorino I Gattilusio.
After the fall of Constantinople in 1453 a large number of Greeks came to the island, and most settled in Theologos and Kastro.
The village has a small church dedicated to St Athanasius, which has the blazon of Gattilusio on one of the outside walls.
Every 18 January the church continues to attract people to celebrate the memory of St Athanasius.