From the Menteş Principality, 15th century AD. From the Wikipedia: The Anatolian beylik of Menteş (1260–1424), with capital in Milas in southwest Anatolia and headquartered in Beçin castle near that city, was one of the frontier principalities established by Oghuz Turkish clans after the decline of the Seljuk Sultanate of Rum. The Beylik was named after its founder, Menteş Bey. It had come into existence by the year 1290. The beylik's core territory corresponded roughly to ancient Caria or the later Muğla Province in Turkey, including the province's three protruding peninsulas.