Galen might have sworn an oath to this 5th century B.C. Greek man he considered the beginning of all medical learning
This intellectual school 
revolutionized medicine in ancient Greece, ... 460 BC on the Greek island of Kos; 
other biographical information, however, ..... Learning resources from Wikiversity
... [DOC] [TLE] Hippocratic Oath - Wikipedia [PAR] A 12th-century Greek manuscript of the Oath.