Possible Clues:

• Such as M, X, V and I
• cc one living in Lazio and other figures
• CD and XL, for example
• MMXVI components
• V, X, L, for example
• Starting with 16 down, they're found in 9 and on 7
• I and others on early watch, for example
• Something popes and Super Bowls have in common
• Symbols of the past to be reckoned with
• Civil, I did mild mix, showing them all up