- Dante Alighieri, 1265-13211
- De consolatione philosophiae (Boethius)1
- Death--Religious aspects--Islam1
- Del Bene, Claudia1
- Devotio moderna1
- Devotional literature, Italian1
- Didactic literature, Latin1
- Diseases1
- Divination--Religious aspects--Islam1
- Divine right of kings1
- Duarte, King of Portugal, 1391-14381
- Dupin, Jean, 1302-13721
- Eastern Turkey1
- Eclipses1
- Edison, Julian I.1
- Education1
- Education of princes1
- Education, Ancient1
- Education--Philosophy1
- Edward VI, King of England, 1537-15531