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Arsameia on the Nymphaios (Armenian: Արշամաշատ, romanized: Arshamashat; Turkish: Eski Kale – "Old Castle") is an ancient city located in Old Kâhta (Eski Kâhta) in Kâhta district, Adıyaman Province, Turkey. The site is near Kâhtaçay, known in ancient times as Nymphaios. Arsameia was a royal seat of the kingdom of Commagene. It is best known for the Hierothesion of King Mithridates I Kallinikos, built for him by his son and heir Antiochos I.