- Theodore, Studites, Saint, 759-8261
- Theological anthropology--Judaism1
- Theology, Doctrinal--Middle Ages1
- Theology--Middle Ages1
- Theology--Study and teaching--Catholic Church1
- Theoricae novae planetarum (Peurbach, Georg von)1
- Thilla, Berto1
- Third Order Secular of St. Francis1
- Third orders1
- Thomas, Apostle, Saint, active 1st century1
- Thomas, Aquinas, Saint, 1225?-12741
- Throat--Diseases1
- Thyestes, King of Olympia and Mycenae (Mythological character)1
- Ties1
- Time--Religious aspects--Islam1
- Timurids1
- Tithes1
- Titles of honor and nobility1
- Tiḳun shovavim1
- To 15091