Author
- Pseudo-Aristotle1
- Pseudo-Cicero1
- Pseudo-Seneca1
- Ptolemy1
- Rashid-al-Din Hamadani1
- Reynoldus Romanus1
- Robert de Saint-Martin1
- Roman Catholic Diocese of Zaragoza1
- Ruzbihan Baqli1
- Sacro Regio Consiglio1
- Safi al-Din al-Urmawi1
- Saʻīd Najm al-Dīn ʻAjamī1
- Seneca1
- Shahab al-Din al-Hijazi1
- Shams-ud-Din Kermani1
- Shem Tov ben Joseph ben Shem Tov Ibn Shem Tov1
- Simeon ben Zemah Duran1
- Sirāj al-Dīn Abū Ḥafṣ ʻUmar Ibn al-Wardī1
- Suetonius1
- Taddeo Alderotti1