Antiochos was the son of Seleukos I, founder of the Seleukid kingdom, and his Sogdian queen, Apama. It was the Ionian city-states that Antiochos spared from the Galatian hordes who hailed him as a god and named him Soter (“Saviour”). See a brief history of his reign here
On the obverse the classical portrait of Antiochus I with his large eyes and straight nose. He is looking only slightly upwards. On the reverse we see Heracles resting after his 12 labours, his club at ease, the lion-skin draped over the rock.
SELEUKID KINGS of SYRIA. Antiochos I. 280-261 BC. AR Tetradrachm (32mm, 16.94 gm). Magnesia ad Sipylum mint. Diademed head right / BASILEWS ANTIOCOU, Herakles seated left on rock, lion’s skin draped over rock, holding club on ground in right hand, left hand at his side; two monograms in exergue. SC 318b=Houghton 625=WSM 1456 (A3/P3; this coin); SNG Spaer -. Ex Arthur Houghton Collection, 625; Petrowicz Collection (Naville X, 15-18 June 1925), lot 900; Bunbury Collection (Sotheby, Wilkinson & Hodge, 7 December 1896), lot 454.