- Ninth century1
- Norbert, of Xanten, Saint, approximately 1080-11341
- Notaries1
- Numbers (Provenance)1
- Occasional poems1
- Octavia, Empress, consort of Nero, Emperor of Rome, approximately 42-621
- Oedipus (Greek mythological figure)1
- Orden de Santiago1
- Orso, Saint1
- Orthodox Eastern Church1
- Palimpsests1
- Paltonibus, Antonio de1
- Pannilini, Francesco1
- Pannilini, Guglielmo1
- Parent and child (Law)1
- Pastoral theology1
- Pastoral theology--Catholic Church1
- Patrick, Saint, 373?-463?1
- Pentecost1
- Persius1