CCCI
Set to 3 different clues across 3 published puzzles, most often “Year in Diocletian's reign” — The New York Times, Thursday, 2 August 2001.
4 letters
Every clue on record, most used first
- Year in Diocletian's reignonce
The New York Times — Thursday, 2 August 2001
- Old-fashioned 301once
The New York Times — Monday, 18 December 2000
- Fourth-centruy dateonce
The New York Times — Thursday, 1 August 1996