| Answer | Crossword Clue |
|---|---|
| PERSIA | Xerxes I's realm |
| PERSIA | Realm of Xerxes I |
| SELFDOM | The I's realm |
| HRE | Otto I's realm (abbr.) |
| HRE | Louis I's realm: Abbr. |
| HRE | Otto I's realm: Abbr. |
| HRE | Otho I's realm: Abbr. |
| HRE | Maximilian I's realm: Abbr. |
| PRUSSIA | King Frederick I's realm |
| HRE | Otto I's realm, briefly |
| HRE | Otto I's realm: abbr. |
| ALSACE | Part of Lothair I's realm |
| ARAGON | Part of Isabella I's realm |
