Gonio-Apsaros Fortress is located 12 km south of Batumi, on the left bank of the River Chorokhi. One of the Georgia’s most ancient settlements was located around this fortress. Due to its strategic location, Gonio-Apsaros became a supporting citadel first for the Romans and later to the Byzantines and Ottomans along the eastern Black Sea coastline. Respectively, the fortress has several layers: the Roman layer (3rd-4th cc BC), the Byzantine layer (6th-7th cc AD) and the Ottoman layer (16th c AD). The history of Gonio-Apsaros fortress references the myth of Jason and the Argonauts. According to the legend, King Aeetes buried his son Apsaros, who was killed by Jason as he fled, in the territory of Gonio. According to some sources, Mathias, one of the 12 disciples of Jesus Christ, is believed to be buried here. There is a museum inside the fortress.