Answer: cdx

AnswerCrossword Clue
CDX410, to Pliny
CDXLXXXII times V
CDXCCV doubled
CDXDouble CCV
CDXCaesar's 410
CDXLXXXII x V
CDX80th prime Roman numeral
CDXOne-fifth of MML
CDXXLI x X
CDXNero's 410
CDXCCV x II