Kastro is a small village in the Greek island of Thassos. It is believed to be the oldest village on the island. The village name comes from the old castle that existed here to protect the inhabitants.
The settlement was first mentioned in 1434 in connection with the establishment of a local fortress or citadel by Umberto Grimaldi, when Thassos was ruled by the Genoese Dorino I Gattilusio. The ruins of the citadel's wall can still be seen. Over the centuries, Kastro, like other mountain villages, was a refuge from pirates. After the fall of Constantinople in 1453 a large number of Greeks came to the island, and most settled in Theologos and Kastro. Under Ottoman administration, the place was known as Yenihisar (New Castle).
The village has a small church dedicated to St Athanasius, which has the blazon of Gattilusio on one of the outside walls. The church was built in 1804, within forty days, with the help of all the inhabitants. The stones used to build the church came from the old castle's ruins. Gattilusio's blazon was added to the church's wall, but it was put upside down. In 1980, the church was declared a historical monument, being one of the oldest churches in Thassos.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.