- Diocletian, Emperor of Rome, 245-3131
- Dion, approximately 408 B.C.-354 B.C.1
- Directories1
- Divine office--Liturgy1
- Double cords1
- Drycthelm, monk of Northumbria, active 7th century1
- Dupin, Jean, 1302-13721
- Durandus, of Saint-Pourçain, Bishop of Meaux, approximately 1275-13341
- Dutch poetry1
- Early maps1
- Ecclesiastical geography1
- Eclipses1
- Economic conditions1
- Edge titles1
- Education, Ancient1
- Education, Greek1
- Education--Philosophy1
- Edward IV, King of England, 1442-14831
- Egypt--Cairo1
- Egypt--Rawdah Island1