- Orpheus (Greek mythology)2
- Otto II, Holy Roman Emperor, 955-9831
- Otto III, Holy Roman Emperor, 980-10021
- Padua1
- Painting, Renaissance1
- Palaeography1
- Pallavicino, Sforza, 1607-16671
- Palmistry -- Early works to 1850.1
- Panofsky, Erwin, 1892-1968.1
- Papacy -- History -- Early works to 1800.1
- Paradise2
- Paradise.1
- Pascal, Blaise, 1623-1662.2
- Pentacles1
- Petrarca, Francesco, 1304-1374 -- Congresses.1
- Philosophy -- Early works to 1800.1
- Philosophy -- Medieval.1
- Philosophy, Renaissance2
- Pico della Mirandola, Giovanni, 1463-14941
- Pignatelli y de Moncayó, Ramón, 1734-1793.1
