Author
- Pius IV1
- Pope1
- Porphyry1
- Principio Fabricii1
- Privy Council of the United Kingdom1
- Prudentius1
- Ptolemaeus Tancredius1
- Ptolemy1
- Qasem-e Anvar1
- Ranieri Farnese1
- Ranuccio Farnese1
- Regia Camera (Duchy of Milan)1
- Regiomontanus1
- Revanî1
- Richard Ward1
- Ro. Ba1
- Robert Fabyan1
- Robert Reade1
- Rodolfo Pio da Carpi1
- Roman Catholic Archdiocese of Siena1