LEO. afterwards archbishop of My tilene. He wrote: 1.
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Commentarius in Aristotelis De Inter pretatione Li- hrum. This commentary was published by Aldus, fol. Venice, 1503, with the commentary of Ammo- nius, from which Leo borrowed very largely, and the paraphrase of Psellus on the same book of Aristotle, and the commentary of Ammonius on Aristotle's Categoriae s. Praedicamenta, In the Latin title of this edition the author is called by a misprint, Margentinus. A Latin version of Leo's commentary, by J. B. Rasarius, has been repeatedly printed with the Latin version of Ammonius. Another Latin version by Hieronymus Leustrius has also been printed. 2. *'E.^ryr](ns eis rci irporepa dvahvTiKoL rod 'ApicrToreAous, Commentarius in Priora Analyiica Aristotelis. This was printed with the commentary of Joannes Phibponus on the same work, by Trincavellus, fol, Venice, 1536 ; and a Latin version of it hj Rasarius has been re- peatedly printed, either separately, or Avith other commentaries on Aristotle. The following works in MS. are ascribed, but with doubtful correctness, to Leo Magentenus : 3. Commentarius in Cate- gorias Aristotelis, is extant in the King's Library at Paris. 4. 'ApiaTOTeKovs crocpKXTiKwv eAeyxwi' epiii-nueia, Expositio Aristotelis De Sophisticis Elen- chis: and 5. 'ApttrTOTeAoujTrept evTTopias TvpoTciaeoov. These two works are mentioned by Montfaucon (Bihl. Coislin. p. 225). The latter is, perhaps, not a distinct work, but a portion of No. 1. In the MS. the author is called Leontius Magentenus, 6. Commentarius in Isagogen. s. Quinque Voces Por- phyrii. Buhle doubts if this work, which is in the Medicean library at Florence (Bandini, Catalog. Codd. Laur. Medic, vol. iii. p. 239), is correctly ascribed to Magentenus. In the catalogue of the MSS. in the king's library at Paris (vol. ii. pp. 410, 421), two MSS. Nos. mdcccxlv. and mcmxxviii,, contain Scholia on the Categoriae, the Analyiica Priora et Posteriora, and the Topica of Aristotle, and on the Isagoge of Porphyry, by Magnentius, Buhle conjectures, with probability, that Magnen- tius is a corruption of Magentenus or Magentinus : if so, and the works are assigned to their real author, we must add the commentaries on the Topica and the Analytica Posteriora to the works already men- tioned. Nicolaus Comnenus Papadopoli speaks of many other works of Leo, but his authority is of little value. (Fabric. Bibl. Graec. vol, iii. pp. 210, 213, 215, 218, 498, vii. 717, viii. 143, xii. 208 ; Montfaucon, I. c. and p. 219 ; Buhle, Opera Aris- totelis, vol. i. pp, 165, 305, 306, ed. Bipont ; Cator log. MStor. BibUoth. Regiae, fol. Paris, 1740, 1, c.) 18. Male IN us (MaAe/Vos), governor of the towns of Hierax, Stylus and others, in the middle of the twelfth century. A decree of his with a Latin version is given by Montfaucon, Palaeogra- phia Grae.ca, p. 410, &c. . 1,9. Medicus. [No, 29,] 20. Of Metapontum. lamblichus (/y/«a^. FjV. c. 36) mentions a Pythagorean philosopher of this name and place, but without giving any further particulars, or assigning to him any date. It is conjectured that he is the Leo to whom Alcmaeon of Crotona [Alcmaeon] dedicated his A6'yos (pua-iKos, or work on natural philosophy (Diog, Laert. viii, 83). Fabricius also proposes to iden- tify him with the Leo, son of Ncoclis, whose 2T0£xeto, Elemcnta sc. Geometrica are mentioned by Proclus {Comment, in Euclid. Lib. ii. c. 4, p. LEO. 74.5 38 of the Latin version of Fr. Barocius, fol, Padua, 1560), and who gave considerably greater accuracy to geometrical science, especially by showing how to distinguish problems which admit of solution from those which cannot be solved. There is, however, a chronological objection to the identifi- cation oi^ Leo, the friend of Alcmaeon, who lived in the sixth century b. c, with Leo the Geo- metrician, who was later than Leodamas of Thasos, and Archytas of Tarentum (Proclus, I. c), Avho belonged to the end of the fifth century b. c, : and it is uncertain whether Leo of Metapontum is not different from both. (Fabric. Bibl. Graec. ro. i. p. 850, vol. vii. p. 718.) 21. Of Mytilene. [No. 17,] 22. Philosophus, [No, 29,] 23. Peripateticus. [No, 17,J 24. Of Pell A. [No. 3.] 25. Pythagoricus. [No. 20,] 26. Rhetor. [Nos. 4 and 7.] 27. Sapiens. [Leo VI. emperor.] 28. Stypiota orSxYPPA (Stuttttt^s), or Stypa (SryTTTys), patriarch of Constantinople in the twelfth century. His patriarchate extended from a, d. 1 1 34 to 1143 (Fabric. Bibl. Graec. vol. vii. p. 721, vol. xi. p, 666). He died just about the time of the ac- cession of the Byzantine emperor Manuel Comnenus, who appointed as Leo's successor Michael Curcuas, a monk of Oxeia, by whom he was himself crowned. (Nicetas Choniat. De Manuele Comneno, i. 2.) A decree of Leo on the lawfulness of certain mar- riages, is given in the ./ms Orientate of Bonefidius (Oeo-^ol 'Apxi^epariKoi, Sanction. Pontific. p. h^) and in the Jus Graeco-Romanum of Leunclavius (Lib. iii. vol, i, p, 217). He is often cited by Nicolaus Comnenus Papadopoli. (Fabric. //. cc.) 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 Mo- rochardanii, tutor of the emperor Theophilus, and patriarch of Constantinople, from about a, d. 832 — 842. (Theoph. Contin. iv. 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 {hiarpi^wv) at Constantinople," an ex- pression 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 Constand • nople, and imparted his intellectual stores to those who resorted to him for instruction. (Theophan. Continuat. iv. 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 in- structed in geometry, accepted the office of secretary to a military officer, during the war between the
