ccli One-fourth of MIV Nero's 251 Middle of the third century Middle of the 3rd century First year of Cornelius's papacy 251, to Caesar 251, in the Forum 20% of MCCLV 10% of MMDX Third-century year 251, in old Rome Mid third-century year Year at the end of the reign of Decius Mid third-century date Half of DII 251, to Cicero Third century date Roman 251