Keywords
- Obligations (Law)1
- Occultism1
- Officium pro defunctis (Catholic Church)1
- Old age1
- On the generation of animals (Aristotle)1
- Ontology1
- Orden de Santiago1
- Oria, Johannes d'1
- Origen1
- Orlandini, Stefano1
- Orthodox Eastern Church1
- Orto, Giovanni dall'1
- Otto I, Holy Roman Emperor, 912-9731
- Outlines and syllabi1
- Pacheco de Silva, Juana1
- Paffiere, Arcangelo1
- Paffiere, Matteo1
- Paganelli, Roberto1
- Pagani, Angiola1
- Pagliaiolo, Cenni1