Author
- Sigismund1
- Signoria of Florence1
- Simon Bredon1
- Simon of Cremona1
- Society of Jesus1
- Society of Saint Anne (Malogoszcz, Poland)1
- Spanish Forger1
- Stefano d'Andrea1
- Stephanus Hugoneti1
- Stephen Batman1
- Stephen Langton1
- Sulpicius Severus1
- Sylvester II1
- Taddea Salamon1
- Tartaleoni family1
- Tengoccio d'Enea de Piccolomini1
- Theobaldus Episcopus1
- Theodore of Mopsuestia1
- Theophrastus1
- Thomas Achelley1