A Dictionary of Greek and Roman biography and mythology

(Ἀκτουάριος), the surname by which an ancient Greek physician, whose real name was Joannes, is commonly known. His father's name was Zacharias; he himself practised at Constantinople, and, as it appears, with some degree of credit, as he was honoured with the title of Actuarius, a dignity frequently conferred at that court upon physicians. (Dict. of Ant. p. 611b.) Very little is known of the events of his life, and his date is rather uncertain, as some persons reckon him to have lived in the eleventh century, and others bring him down as low as the beginning of the fourteenth. He probably lived towards the end of the thirteenth century, as one of his works is dedicated to his tutor, Joseph Racendytes, who lived in the reign of Andronicus II. Palaeologus, A. D. 1281-1328. One of his school-fellows is supposed to have been Apocauchus, whom he describes (though without naming him) as going upon an embassy to the north. (De Meth. Med. Praef. in i. ii. pp. 139, 169.)

[W.A.G]