- Regiomontanus, Joannes, 1436-1476. Calendarium1
- Regula (Benedict, Saint, Abbot of Monte Cassino)1
- Relations1
- Religious literature, Italian1
- Religious poetry1
- Roman Civil War (Rome : 43-31 B.C.)1
- Roman capitals (Lettering)1
- Roman law1
- Romances, Italian1
- Rosary1
- Rosh Hodesh1
- Rubrics1
- Sacraments--Catholic Church1
- Sacred music texts1
- Salutati, Coluccio, 1331-14061
- Satire, Greek1
- Satires1
- Satirical literature1
- Scholasticism1
- Scriptum super IV libros Sententiarum (Thomas, Aquinas, Saint)1