- Sancho IV, King of Castile and Leon, 1257-12951
- Sangalletti, Bastiano1
- Sangalletti, Vittoria1
- Santa Maria Novella (Church : Florence, Italy)1
- Santa Maria del Fiore (Cathedral : Florence, Italy)1
- Satellites--Phases1
- Satire1
- Satire, Latin1
- Saudi Arabia--Hejaz1
- Savelli, Troilo, -15921
- Savonarola, Girolamo, 1452-14981
- Saxo, Andreas1
- Scala, Giovanni1
- Scalandroni family1
- Schlüsselburg, Konrad, 1543-16191
- Schweinitz (Germany)1
- Science, Medieval1
- Scribes, Jewish1
- Scrolls1
- Seccrani, Marco1