Possible Clues:

• In the year: Lat.
• 365 days in old Rome
• 52 settimane
• and 9 across, Now there might be a capital ad for this, in short
• __ Hegirae (Moslem reckoning)
• Year in Trajan's reign
• Casca's "in the year"
• Latin word on a monument
• 'Domini' lead-in
• The ''A'' in A.D.