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

CABEINIA TRANKYLLEINA AV, diademed, draped bust right.
PROYCAEWN, Female deity or Muse seated left, holding scroll. 

RecGen 157; SNG von Aulock 881

With permission of Tom Vossen on vcoins.com, June 2009.