Author
- Simon de Bon1
- Simon de Lenis1
- Simone Cordo1
- Simone di Nicolo Petroni1
- Sixtus V1
- Smoyel1
- Stefano Fieschi1
- Stephan Brechtel1
- Stephanus Hugoneti1
- Stephen Langton1
- Sulaymān Ḥikmatī1
- Sylvester II1
- Syriac Orthodox Church1
- Taddea Salamon1
- Taddeo Alderotti1
- Tartaleoni family1
- Tengoccio d'Enea de Piccolomini1
- Theobaldus Episcopus1
- Theodore of Mopsuestia1
- Thiebaus de Maliers1