Approximately 25km/15 miles north-east of Adiyaman, above the east bank of the Kahta Cayi (Nymphaios) opposite Yeni Kale castle near Eski Kahta (see below), is a cult and burial site known today as Eski Kale (Mithridates I Kallinikos) and the summer residence of the Kommagene rulers founded in the 3rd c. B.C. by Arsames. In addition to the remains of steps and buildings on the summit plateau (mosaics from the 2nd c. B.C.), a number of relieves and rock chambers are passed on the approach. Lower relief (II): the god Mithras - Helios (a further part depicting Antiochus II is missing); middle relief (I): (fragments) Mithridates and his son Antiochus I, antechamber (cult site of the god Mithras?) with, to the rear, a rock tunnel with fourteen steps leading to the burial chamber of Mithridates (?); upper relief (III): Dexiosis relief of king (Mithridates or Antiochus I) with the demigod Hercules (extending his right hand), inscription by Antiochus I, steeply-stepped, blocked, rock tunnel (158m/518ft deep), purpose unknown.