(Ἱερὸν ὄρος; Hieròn óros).
 Holy mountain
Holy mountain, name of a mountain range on the Propontis, modern Tegirdağ. Religious centre of the Thraci (Str. 7, fr. 55). The fortress of the Odrysae bearing the same name (Xen. An. 7,1,14) was situated there. Cotys I entrenched himself there in 362 BC at the time of the revolt of Miltocythes (Dem. Or. 23,104). Philip II conquered H. in 346 (Dem. Or. 9,15; Aeschin. Leg. 2,82f.; 3,73f.).