- Maimonides, Moses, 1135-12041
- Marsi, Paolo, 1440-14841
- Melber, Johannes, 15th cent.1
- Olaus, Magnus, Archbishop of Uppsala, 1490-15571
- Ovid, 43 B.C.-17 or 18 A.D1
- Perotti, Niccolò, 1430-14801
- Peter Lombard, Bishop of Paris, ca. 1100-11601
- Petrus Angelus, de Monte Ulmi1
- Peurbach, Georg von, 1423-14611
- Piranesi, Giovanni Battista, 1720-17781
- Pope (1294-1303: Boniface VIII)1
- Prudentius, b. 3481
- Pérez, Diego, fl. 15741
- Rawlins, William, printer1
- Regiomontanus, Joannes, 1436-14761
- Rolevinck, Werner, 1425-15021
- Royal Society (Great Britain). Museum1
- S. Augustinus1
- S. Gregorius Magnus1
- Sigebertus Gemblacensis1