|Metropolitan of Nicomedia|
|Born||7 April 1833|
|Died||18 November 1917|
Constantinople, Ottoman Empire
(modern-day Istanbul, Turkey)
Philotheos Bryennios (Greek: Φιλόθεος Βρυέννιος; 7 April 1833 – November 18, 1917) was a Greek Orthodox metropolitan of Nicomedia, and the discoverer in 1873 of an important manuscript with copies of early Church documents.
Born in the Tavtalos (Kurtuluş) district of Constantinople, with the secular name of Theodore, he was educated at the theological school in Halki, and at the universities of Leipzig, Munich, and Berlin. He became a professor at Halki in 1861, and then director in 1863. In 1867 he went to head the Patriarchal School in Constantinople, leaving in 1875 to attend the Old Catholic conference in Bonn, during which he was appointed metropolitan of Serres in Macedonia. In 1877 he became Metropolitan of Nicomedia.
Metropolitan Bryennios died in 1917 in his native Constantinople.
In 1873, he discovered a manuscript in the Jerusalem Monastery of the Most Holy Sepulchre, located in the Greek quarter of Constantinople, which contained a synopsis of the Old and New Testaments arranged by St. John Chrysostom, the Epistle of Barnabas, the First Epistle of Clement to the Corinthians, the Second Epistle of Clement to the Corinthians, the Teaching of the Twelve Apostles (Didache), the spurious letter of Mary of Cassoboli, and twelve pseudo-Ignatian Epistles. The letters were published in 1875, and the Didache in 1883; the letters of Clement and the Didache had notes written by Bryennios. The discovery of the Didache was significant because writers of the early 3rd, 4th and later centuries had spoken of it, but it was presumed lost.
- "Μητροπολίτης Νικομηδείας, Φιλόθεος Βρυέννιος" [Metropolitan of Nicomedia, Philotheos Byrennios] (in Greek). Ιερά Θεολογική Σχολή της Χάλκης [Holy Theological School of Halki]. 2017-05-24. Retrieved 2021-12-02.
- Etheredge, Laura; et al. (2021-01-01). Philotheos Byrennios. Encyclopædia Britannica. Retrieved 2021-12-02.