| Reign | From 800 • to 1806 |
| Title | Holy Roman Emperor |
| Position | Supreme ruler |
| Authority | Temporal • Spiritual |
| Religions | Catholicism • Protestantism • Islam • Eastern Orthodoxy |
| Challenges | Diversity • Political crises |
| Territories | Europe • Middle East • Africa • Asia |
| Legal system | International and religious law |
| Political system | Vassalage and imperial diets |
