| Answer | Crossword Clue |
|---|---|
| HRE | Realm of Otto I (abbr.) |
| HRE | Realm of Otto I: Abbr. |
| HRE | Realm of Otto I (Abbr.) |
| HRE | Otto I's realm: abbr. |
| HRE | Otto I's realm: Abbr. |
| HRE | Otto I's realm (abbr.) |
| HRE | Otto the Great's realm: Abbr. |
| HRE | Domain of Otto I (abbr.) |
| HRE | Domain of Otto I: Abbr. |
| HRE | Otto I, for one (abbr.) |
| HRE | Otto I was its first leader: Abbr. |
| HRE | Realm of Maximilian I (abbr.) |
