Valerian I, AE26 of Nicaea, Bithynia.

POY LIK OYALERIANOC CEB, radiate, draped, cuirassed bust right.
NIKAIEWN, Gallienus standing half right clasping hands
with Valerian, standing left, both holding sceptres, to right 
Homonoia standing left, holding patera.

McClean 7507; RecGen 804-805; Waddington 447; SNG von Aulock 71.

courtesy of Asta Tintinna Numismatica and deamoneta.com, Sep, 2012