| Clue | Source | Date |
|---|---|---|
| 800 in Roman numerals (4) | The Guardian Weekend | 09 May 2026 |
| 800, in Roman numerals | Commuter | 07 Feb 2025 |
| 800, in old Rome | Eugene Sheffer | 27 Jun 2023 |
| 800, in old Rome | ||
| Year that Charlemagne was crowned emperor | ||
| 800, to Caesar | ||
| XL x XX | ||
| XL times XX | ||
| L x XVI | ||
| Eight hundred | ||
| Twice CD. |