| Clue | Source | Date |
|---|---|---|
| Roman 404 | Eugene Sheffer | 13 Jul 2018 |
| Nero's 404 | Premier Sunday | 17 Jan 2016 |
| Early fifth-century year | ||
| Early 5th-century year | ||
| Early 5th-century year | ||
| 404, to Caesar | ||
| MMXX ÷ V | ||
| Year of the last known Roman gladiator competition | ||
| Caesar's "Not Found" code? | ||
| Roman 404 | ||
| 404 in old Rome | ||
| 404, in old Rome | ||
| Early fifth century date | ||
| 404, in old Rome | ||
| MCCXII/III | ||
| MMXX ÷ V | ||
| Twice CCII | ||
| Double CCII | ||
| 404, once | ||
| 404 |