Valerian I, with Gallienus and Valerian II, AE of Nicomedia, Bithynia. AD 253-260. 11.75 g. 

AYT OYALERIANOC-GALHNOC OYA-LERIANOC KAICA (sic) in three lines above, CEBBB below, radiate and draped busts of Valerian and Gallienus left and right, bare-headed, draped bust of Valerian II right between them. 
NIKOMHDEW-N above, TRIC NEWKORWN below, three temples around an altar with serpent. 

RecGen 408 type 3; BMC 69; Paris 1468; SNG von Aulock 860; 

With permission of Numismatica Ars Classica auction 100, Lot 1201, May 2017.