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
Succeeded by
Cosmas I

ca:Joan VIII Xifilíru:Иоанн VIII Ксифилин

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