an Entity references as follows:
Aelius Galenus or Claudius Galenus (/ɡəˈliːnəs/; Greek: Κλαύδιος Γαληνός; AD 129 – c. 200/c. 216), better known as Galen of Pergamon (/ˈɡeɪlən/), was a prominent Greek physician, surgeon and philosopher in the Roman empire.