Related Clues:

• First-century date
• Weeks per ''annum''
• Roman deck count?
• XIII x IV
• Roman 52
• Nero's 52
• Weeks in an annus
• 52, once
• Full deck Nero never played with?
• Card-deck count, to Cato
• Caesar's 52
• 7 sqvared, plvs 3
• MXL ÷ XX
• CIV half
• A little over half a century in old Rome