| Clue | Source | Date |
|---|---|---|
| 15th-century pope | LA Times Daily | 27 Jun 2015 |
| Only reigning pope to write an autobiography | LA Times Daily | 26 Mar 2015 |
| 15th-century pope | ||
| Only reigning pope to write an autobiography | ||
| Only reigning pope to write an autobiography | ||
| Only reigning pope to write an autobiography | ||
| 15th-century pontiff who was the only pope to write an autobiography | ||
| 15th century pope | ||
| 15th cen. pope |