Author
- Orderic Vitalis1
- Orosius1
- Ottmar Luscinius1
- Otto Ege1
- Panormitanus1
- Paolo da Firenze1
- Paramaśivāśrama1
- Paul of Aegina1
- Paul of Pergula1
- Paul of Venice1
- Paul the Deacon1
- Paulus Melissus1
- Pedanius Dioscorides1
- Pere Rossell1
- Peter Paludanus1
- Peter Pascual1
- Peter Schmieher1
- Peter of Bergamo1
- Peter of Limoges1
- Petrus de Braco1