- Pachymeres, George, 1242-ca. 13101
- Palladinus, Jacobus1
- Paolo,--Veneto,--ca. 1370-14281
- Peter Lombard,--Bishop of Paris,--approximately 1100-1160.--Sententiarum libri IV1
- Peter,--of Blois,--ca. 1135-ca. 12121
- Pius--II,--Pope,--1405-14641
- Pseudo-Augustinus1
- Pseudo-Cicero2
- Remigius,--of Auxerre,--ca. 841-9081
- Rudolf--II,--Holy Roman Emperor,--1552-16121
- Ruffo, Giordano1
- San Domenico (Church : Gaeta, Italy)1
- Schlichting, Albert1
- Schoppe, Kaspar,--1576-16491
- Schøyen, Martin--Bookplate1
- Servius,--4th cent1
- Seuse, Heinrich,--1295-13661
- Simone Fidati,--da Cascia,--d. 13481
- Sixtus--V,--Pope,--1520-15901
- Statius, P. Papinius--(Publius Papinius)1