Theophylact (θ εοφυλάκτος ), surnamed Si-mocatta, a Byzantine historian, born of an Egyptian family in Locris in the latter part of the 6th century, died about 629. From 610 till about the close of his life he held various offices at Constantinople. He wrote a history of the reign of the emperor Maurice (582-602), of which a Latin translation, Historioe Mauricii Tiberii Imperatoris Libri VIII., was published at Ingolstadt in 1648. Besides 85 letters (Epis-tolce Morales, Rustlcoe et Amatorioe, 4to, Cracow, 1509), he wrote a work on the nature of animals, especially of man ('Aπορίαι φυσικαί, or Quoestiones Physicoe, 4to, Leyden, 1596; Leip7 sic, 1653.) These two works were published together at Paris in 1835.

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Theophylact, a Greek theologian, born in Constantinople probably about the middle of the 11th century, died after 1112. He was instructed by Clement, archbishop of Bulgaria, and became archbishop of Achris or Achrida, a chief city of Bulgaria, between the years 1070 and 1077. He engaged in the controversies of his day, especially those relating to the true character, procedure, and office work of the Holy Ghost, and the question whether or not common bread or only unleavened should be used in the sacrament, opposing the views of the Latin church. He compiled commentaries upon the minor prophets and a large part of the New Testament from the works of Chrysostom, and wrote a treatise on royal education ( Παιδεία Βασιλική, or Insti-tutio Regia) for the instruction of his pupil Prince Constantine Porphyrogenitus, the son of Michael VII. There exist 75 of his letters, with some homilies and orations and a few small treatises. An edition of all his works in Greek and Latin was issued at Venice (4 vols, fol., 1754-'63).