Zaccaria:Genoese family engaged mostly in commercial activities from the 13th to the 15th century.
Zacharias Aktouarios, John (ca. 1275-1328):The head physician in the court of Andronikos II Palaiologos. He sought ways to make more systematic use of the findings of ancient Greek physicians, particularly those of Galen. He taught astronomy to George Oinaiotes, and wrote medical treatises, among which the Method of Medicine, Urines, To Galen on therapeutic methods, On the Workings and Illnesses of the Spirit of the Soul, On injurious animals.