Author
- Roger Bigod, 2nd Earl of Norfolk1
- Roger Waltham1
- Roman Catholic Diocese of Regensburg1
- Sallust1
- Santa Maria in Portico a Fontegiusta1
- Senate of the Republic of Venice1
- Serapion the Younger1
- Sextus the Pythagorean1
- Sigismund1
- Signoria of Florence1
- Sixtus IV1
- Sixtus V1
- Stephanus Hugoneti1
- Sylvester II1
- Taddea Salamon1
- Tartaleoni family1
- Tengoccio d'Enea de Piccolomini1
- Theobaldus Episcopus1
- Thomas Brooke1
- Thomas of Cantimpré1