Answer: clvi

AnswerCrossword Clue
CLVI

XII x XIII

CLVI

XXXIX quadrupled

CLVI

Half of CCCXII

CLVI
Year in reign of Antoninus Pius.
CLVI
One-fourth of DCXXIV
CLVICato's 156
CLVIRomans' 156
CLVIOvid's 156
CLVIMid second-century date
CLVI156, to Livy