John of Alexandria (fl. 600-642) was a

Byzantine The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...

medical writer who lived in

Alexandria Alexandria ( or ; ar, ٱلْإِسْكَنْدَرِيَّةُ ; grc-gre, Αλεξάνδρεια, Alexándria) is the second largest city in Egypt, and the largest city on the Mediterranean coast. Founded in by Alexander the Great, Alexandria ...

, in present-day Egypt. He is thought to be the author of a commentary on

Galen Aelius Galenus or Claudius Galenus ( el, Κλαύδιος Γαληνός; September 129 – c. AD 216), often Anglicized as Galen () or Galen of Pergamon, was a Greek physician, surgeon and philosopher in the Roman Empire. Considered to be one of ...

's ''De sectis'', a Latin version of which survives in several manuscripts. He wrote a commentary on

Hippocrates Hippocrates of Kos (; grc-gre, Ἱπποκράτης ὁ Κῷος, Hippokrátēs ho Kôios; ), also known as Hippocrates II, was a Greek physician of the classical period who is considered one of the most outstanding figures in the history of ...

' book about the foetus (''In Hippocratis De natura pueri commentarium''), which survives in one Greek manuscript and in a 13th-century Latin version made for King Manfred of Sicily. He also wrote a commentary on the sixth book of Hippocrates' ''Epidemics'' (''In Hippocratis Epidemiarum librum VI commentarii fragmenta''), known from an anonymous Latin translation and from extracts from the Greek original, entered in the margins of a Greek translation of an Arabic medical text.

References

7th-century deaths 7th-century Byzantine physicians Ancient Alexandrians 7th-century Byzantine scientists 7th-century Byzantine writers {{Byzantine-bio-stub