Eustathius of Constantinople

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Eustathius was Ecumenical Patriarch of Constantinople from 1019 to 1025.

Eustathius was the protopresbyter of the imperial palace when he was raised to the Patriarchal throne by the Emperor Basil II. Eustathius participated in the efforts of the Byzantines in 1024 to come to an accommodation with the Latin Papacy concerning the widening gap between the Western and Eastern churches, which culminated in the Schism of 1054. At the time of Eustathius, the Papacy claimed dominion over the Christian world, not just primacy, a position which offended Constantinople, the effective spiritual guides of much of the East to include the Russians, Bulgarians and Serbs. Eustathius offered a compromise to Pope John XIX, suggesting that the Orthodox Patriarch would be ecumenic in its own sphere (in suo orbe) in the East as the Papacy was in the world (in universo).[1] It is assumed this was Eustathius' effort to retain control over the Southern Italian churches.[2] While the offer was rejected, there was an acceptance by John of the practice of the Byzantine Rite in the south of Italy in exchange for the establishment of Latin Rite churches in Constantinople.[3]


  1. Previte-Orton, p. 275.
  2. Hussey, p. 122
  3. Runciman, p. 123.


  • Charles William Previté-Orton, ed.. The Shorter Cambridge Medieval History, Vol. 1. Cambridge: University Press, 1979.
  • Steven Runciman. Byzantine Civilisation. London, University Paparback, 1961.
  • JM Hussey. The Orthodox Church in the Byzantine Empire. Oxford: Clarendon Press, 1986.
Titles of Chalcedonian Christianity
Preceded by
Sergius II
Patriarch of Constantinople
Succeeded by
Alexius I the Studite