Related Clues:

• Ninth day before 39-Down
• March 15, to Brutus
• Midmonth, to Caesar
• A 15th
• Middle of March
• Tough time for Caesar
• Bad day for 25-Across
• March 15, e.g.
• March fifteenth, to Caesar
• Midmonth time
• Julius Caesar's last day
• Dangerous time
• December 13th, e.g.
• Roman calendar notation
• Clarifying phrase