Related Clues:

• Bygone era
• Cenozoic, e.g.
• Long time follower
• Age
• '___ Yes!' (old political placard)
• Back, in a way
• One for the history books
• Period in history
• Elizabethan ___
• Christian ___
• Ballpark fig.
• Two or more periods
• See 64-Across
• Stat. that's good when low
• Detergent brand