Johannes Zacharias Actuarius (Greek: Ἰωάννης Ζαχαρίου Ἀκτουάριος; c. 1275 – c. 1328), son of Zacharias (Greek: Ζαχαρίας), was a Byzantine physician in Constantinople. He is given the title of Actuarius, a dignity frequently conferred at that court upon physicians.
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