Historical clue formulations

• "Yes, there is ____!" — 2012-07-17
• "There is ___!" — 2012-04-08
• Steinbeck's "To ___ Unknown" — 2007-04-22
• Steinbeck's "To ___ Unknown" — 2000-04-18
• "Yes, there is ___!" — 1999-01-01
• "Yes, there is ___!" — 1998-10-24
• "This man is now become _____":"Julius Caesar" — 1995-09-24