29. Of THESSALONICA, an eminent Byzantine philosopher and ecclesiastic of the ninth century. Of the time or place of his birth nothing is known. He was the kinsman of the iconoclast Joannes (or as his enemies called him, on account of his obnoxious sentiments, Jannes), who was of the illustrious family of the Morocharzamii or Morochardanii, tutor of the emperor Theophilus, and patriarch of Constantinople, from about A. D. 832 --842. (Theoph. Contin. 4.26, comp. c. 6; and Symeon Magister, De Michaele et Theodora, c. 2.) Leo was characterized by his devotion to learning: he studied grammar and poetry "while staying (διατρίβων) at Constantinople," an expression which seems to indicate that he was not a native of that city; and rhetoric, philosophy, and arithmetic, under Michael Psellus, in the island of Andros. He visited the monasteries in the adjacent parts of continental Greece, examining and using their libraries, and studying and meditating upon the volumes obtained from them, amid the solitude of the mountains. Having thus acquired a great store of knowledge, not only in the sciences above mentioned, but in geometry, astronomy, including astrology, and music, he again visited Constantinople, and imparted his intellectual stores to those who resorted to him for instruction. (Theophan. Continuat. 4.29; Cedrenus, Compendium, p. 547, &c., ed. Paris, vol. ii. p. 165, &c., ed. Bonn.) Neither his learning, however, nor his connexions sufficed to raise him from obscurity, until he became, by a remarkable accident, known to the emperor Theophilus. A pupil of Leo, whom he had instructed in geometry, accepted the office of secretary to a military officer, during the war between the
Symeon (De Mich. et Theodora, c. 46) has described a remarkable method of telegraphic communication, invented by Leo, and practised in the reigns of Theophilus and his son Michael. Fires kindled at certain hours of the day conveyed intelligence of hostile incursions, battles, conflagrations, and the other incidents of war, from the confines of Syria to Constantinople; the hour of kindling indicating the nature of the incident, according to an arranged plan, marked on the dial plate of a clock kept in the castle of Lulus, near Tarsus, and of a corresponding one in the palace at Constantinople.
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