- Manuscripts, Latin (Medieval and modern)1
- Manuscripts, Medieval1
- Manuscripts, Spanish1
- Massachusetts--Boston1
- Maximilian I, Holy Roman Emperor, 1459-15191
- Medicine1
- Medicine--Formulae, receipts, prescriptions1
- Mehmed II, Sultan of the Turks, 1432-14811
- Nobility1
- Papal documents1
- Paul V, Pope, 1552-16211
- Philip III, King of Spain, 1578-16211
- Philip IV, King of Spain, 1605-16651
- Piccolomini, Andrea de1
- Piccolomini, Jacopo de1
- Pius II, Pope, 1405-14641
- Pius IV, Pope, 1499-15651
- Poetry1
- Political poetry1
- Portugal1