who is considered to be the most influential writer of all time on medical subjects
Galen Aelius Galenus or Claudius Galenus (/ɡəˈliːnəs/;[1] Greek: Κλαύδιος Γαληνός; September 129 AD – c. 200/c. 216), often Anglicized as Galen and better known as Galen of Pergamon (/ˈɡeɪlən/),[2] was a prominent Greek physician, surgeon and philosopher in the Roman Empire.[3][4][5] Arguably the most accomplished of all medical researchers of antiquity, Galen influenced the development of various scientific disciplines, including anatomy,[6] physiology, pathology,[7] pharmacology,[8] and neurology, as well as philosophy[9] and logic.