Euthymius I of Constantinople

Euthymius I Syncellus
Ecumenical Patriarch of Constantinople
Consecration of Euthymius as Patriarch of Constantinople. Miniature from the Madrid Skylitzes.
Installed907
Term ended912
PredecessorNicholas Mystikos
SuccessorNicholas Mystikos
Personal details
Bornc. 834
Seleucia in Isauria
(modern-day Silifke, Turkey)
Died5 August 917
"ta Agathou", near Constantinople
(modern-day Istanbul, Turkey)
NationalityByzantine Empire

Euthymius I Syncellus (Greek: Εὐθύμιος ὁ Σύγκελλος, c. 834 – 5 August 917) was the Ecumenical Patriarch of Constantinople from 907 to 912. A monk since his youth, he became spiritual father of the future emperor Leo VI the Wise, and was raised by him to the high ecclesiastical office of syncellus. Despite his turbulent relationship with Leo, in 907 he was appointed to the patriarchate and held the post until his deposition shortly before or after Leo's death in 912.