R
- Rabanus Maurus (or Hrabanus Maurus), (c.783-856)
- Ratramnus (died c. 868)
- Abu Bakr Muhammad ibn Zakariyya al-Razi (or Rhazes), (865-925)
- Abu Hatim al-Razi (died c. 934)
- Fakhr al-Din al-Razi (c. 1150 - 1210)
- Remigius of Auxerre (c. 841 - 908)
Read more about this topic: List Of Philosophers Born In The 1st Through 10th Centuries