Ancient Leontio

First W.M. Leake identified the ruins of Kastritsi hill, located 3km. of the monastery of Vlasia, with those of ancient Tritia. Also, he placed the Achaean city of Leontio, in the present village of Leontio (formerly Gourzoumisa). His opinion prevailed for many decades, until A. Wilhelm argued that ancient Tritia was located in Agia Marina Tritaia, a fact which was later confirmed by P. Nerantzoulis.

Polybius claimed that Leontio is one of the first twelve Achaean cities and one of the ten that still existed in his days.

On Kastritsi hill is saved a fortified enclosure, the towers and its eastern gate. In 1958 N. Gialouris excavated the theater, which is located within the walls to the northeast of the hill, whose aisles and nine rows of seats are preserved. The foundations of houses and other buildings are visible throughout the hill.