Back Eutimi Sincel·le Catalan Πατριάρχης Ευθύμιος Α΄ Greek Euthymius I of Constantinople English Eutimio I de Constantinopla Spanish Euthyme Ier de Constantinople French Eutimio di Costantinopoli Italian Ефтимиј I Цариградски Macedonian Euthymios I av Konstantinopel NB Eutymiusz I Synkellos Polish Eutímio I de Constantinopla Portuguese
Euthymios I. Synkellos (griechisch Ευθύμιος Α΄ Σύγκελλος; † 5. August 917) war Patriarch von Konstantinopel (907–912).