A hierothesion (Ancient Greek ἱεροθέσιον 'holy seat'), in Commagene, is a monument or royal mausoleum.
It is also used separately for Nemrud Dagh archeology as a tomb in the form of a tumulus.
The term is used in particular in connection with three monuments:
The Arsameia hierothesion for King Mithridates I Callinicus, built by his son King Antiochus I Theos of Commagene; The Mount Nemrut hierothesion for King Antiochus I Theos of Commagene; The Karakuş Tumulus hierothesion for Queen Isias and Princesses Antiochis of Commagene and Aka I of Commagene, built by Mithridates II of Commagene.
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