One of the best-preserved ancient Greek cities, Kassopi is situated at an altitude of 650m, on a hill in the southern side of Zalongo, 20km north of Nicopolis. The city was built before the middle of the 4th century BC and was the chief settlement of the Kassopai, a Thesprotian tribe that broke away from the rest of the Thesprotians around 400 BC and formed an independant state. The size of the city, two theatres and the prytaneion, unearthed by archaeologists, all indicate that it was the tribes cultural centre. Kassopi was finally destroyed by the Romans in 167 BC and was eventually deserted by its inhabitants when they were forced to settle in Nikopolis at the end of the 1st century BC.