Arabia Petraea: Gerasa, AE 21mm, Tyche & River god Image rights: wildwinds.com Arabia Petraea: Gerasa, Æ 21mm, 9.0 grams. Laureate and draped bust of Commodus right. On the left, Tyche stands holding a rudder and a cornucopiae, on the right a togate figure holds a scepter, with a river god below. Spijkerman 21. Gerasa, the site of the Temple of Artemis, was added to the Province of Arabia following Trajan's victory over the Nabataeans in 106 A.D.