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This article is about the Patriarch of Constantinople. For his nephew, the Byzantine historian, see John Xiphilinus.

Joannes Xiphilinus, a native of Trebizond, also known as John Xiphilinus or John VIII, was patriarch of Constantinople from 1064-1075. He was the uncle of John Xiphilinus the Epimator. John VIII also wrote a hagiography of Saint Eugenios of Trebizond.

Preceded by Constantine III Lichoudes	Patriarch of Constantinople 1064–1075	Succeeded by Cosmas I

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