Tranquillina AE28 of Prusa ad Olympum, Bithynia. AD 238-244, 9.82 g. 

CABEINIA TRANKYLLEINA, draped bust right, wearing stephane. 
PROYCAEWN, Artemis Phosphoris walking left, holding torch in each hand. 

RecGen 156; BMC 33; SNG von Aulock 880; SNG Righetti 681-682.

With permission of cngcoins.com, auction 352, Lot 295, June 2015.