On the left is a slate orthostat depicting Antiochus I Epiphanes (on the left) shaking hands with Hercules (as usual, nude, carrying a club and a lion pelt).
For a VERY VERY SIMILAR depiction of the father of Antiochus, Mithridates I, at nearby Arsameia Click Here.
To view the orthostat on the right Click Here.
For commentary on the very important lion orthostat Click Here.
For a map and a brief description of Nemrut Dagi Click Here.