- Tasʹhīl al-fawāʼid wa-takmīl al-maqāṣid (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)1
- Taxation1
- Taxation, Papal1
- Textbooks1
- Theban Legion (Legendary saints)1
- Theology, Doctrinal--Middle Ages1
- Third Order Regular of St. Francis1
- Toledo, Pedro de, 1484-15531
- Travel1
- Trials (Heresy)1
- Trigonometry1
- Trinity1
- Trionfi (Petrarca, Francesco)1
- Troilus (Legendary character)1
- Turkish Wars (Venice, Italy : 1453-1571)1
- Turks1
- Uguccioni, Benedetto1
- Uguccioni, Carlo1
- Urban VII, Pope, 1521-15901
- Urine--Analysis1