Answer: cxi

AnswerCrossword Clue
CXILI + LX
CXIOne-fifth of DLV
CXIXXXVII trebled
CXI111, in old Rome
CXIHerod's 111
CXI111, once
CXI111.
CXISecond Century date.
CXIYear in Trajan's reign
CXIYear that in Arabic numerals has all repeated digits
CXIRoman 111
CXISecond-century year
CXINero's 111
CXICaesar's 111