- Leo X, Pope, 1475-15211
- Letters, Papal1
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Manuscripts, European1
- Manuscripts, Latin (Medieval and modern)1
- Military religious orders1
- Monastic and religious life1
- Monasticism and religious orders for women1
- Novitiate1
- Orden de Santiago1
- Papacy1
- Papal briefs1
- Parchment1
- Piccolomini della Triana, Silvio, 1878-19621
- Piccolomini, Andrea1
- Piccolomini, Enea di Giovanno di Nanni Todeschini1
- Piccolomini, Nerius Gabrielli de1
- Politi, Clemente1
- Popes1
- Privileges and immunities1