Eustratius of Nicaea (Greek: Εὐστράτιος; c. 1050/1060-c. 1120)[1] was Metropolitan bishop of Nicaea in the early 12th century. He wrote commentaries to Aristotle's second book of Analytica and the Ethica Nicomachea.

Eustratius was a pupil of John Italus, although he had deliberately dissociated himself from John's supposed heretical views when John was condemned around 1082.[2] A few years after the trial of Italus, he wrote a dialogue and treatise on the use of icons directed against Leon, the bishop of Chalcedon, who had accused the emperor Alexius Comnenus of sacrilege and iconoclasm in the way in which he had stripped the churches of gold to fund his wars.[3] For this he gained the emperor's friendship, and this probably helped him to become Metropolitan bishop of Nicaea. Eustratius was said by Anna Comnena to have been wise both in mundane and in religious matters and especially expert in argument.[4] Nevertheless he found himself accused of heresy in 1117, and a charge was placed before the Synod of Constantinople which narrowly succeeded.[2] As a result Eustratius was formally suspended for life.

Two commentaries by Eustratius on the works of Aristotle survive:[1]


  1. 1.0 1.1 Donald J. Zeyl, Daniel Devereux, Phillip Mitsis, 1997, Encyclopedia of Classical Philosophy, page 59. Greenwood Press
  2. 2.0 2.1 Joan Mervyn Hussey, 1990, The Orthodox Church in the Byzantine Empire, pages 150-1. Oxford University Press
  3. H. Paul F. Mercken, 1973, The Greek Commentaries on the Nicomachean Ethics of Aristotle in the Latin Translation of Robert Grosseteste. Volume 1, pages vi-vii. BRILL.
  4. Georgina Grenfell Buckler, 1968, Anna Comnena; a Study, page 294. Clarendon Press
ca:Eustraci de Nicea

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