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- History93
- Catholic Church55
- Church history50
- Church and state43
- Foreign relations28
- Papacy17
- Reformation14
- Bishops13
- Popes12
- Politics and government10
- Gregory VII, Pope, approximately 1015-10857
- Temporal power7
- Ecclesiastical law6
- Henry IV, Holy Roman Emperor, 1050-11066
- Middle Ages6
- Political science6
- Kings and rulers5
- Philosophy5
- Religious aspects5
- Charlemagne, Emperor, 742-8144