Author
- Prudentius1
- Pseudo-Cicero1
- Pseudo-Joachim of Fiore1
- Ptolemaeus Tancredius1
- Ptolemy1
- Ranieri Farnese1
- Ranuccio Farnese1
- Regia Camera (Duchy of Milan)1
- Regiomontanus1
- Ressani family1
- Richard Brooke1
- Richard Ward1
- Robert Reade1
- Rodolfo Pio da Carpi1
- Roger Alban1
- Roman Catholic Archdiocese of Siena1
- Roman Rota1
- Rudulphus Bollartus1
- Sebastian Schindler1
- Senate of the Republic of Venice1