Author
- Porphyry1
- Privy Council of the United Kingdom1
- Ptolemaeus Tancredius1
- Qasem-e Anvar1
- Ranuccio Farnese1
- Regia Camera (Duchy of Milan)1
- Regiomontanus1
- Republic of Venice1
- Richard Ward1
- Robert Cooke1
- Rodolfo Pio da Carpi1
- Roman Catholic Archdiocese of Siena1
- Royal Chancellery of Granada1
- Saadi1
- Safi al-Din al-Urmawi1
- Salomon Trismosin1
- Sangalletti family1
- Sebastian Schindler1
- Senate of the Republic of Venice1
- Simone Gondi1