Sources and Attestation
The Orthodox tradition surrounding Eutychius is preserved almost entirely in his liturgical commemoration. The OCA synaxarion for May 28 identifies him as a co-worker with the holy apostles who suffered for Christ in Melitene in the first century, and offers no further biographical detail.
The appointed troparion characterizes him as a successor to the apostolic throne who taught the word of truth and defended the faith to the point of shedding his blood, language consistent with his rank as a hieromartyr and hierarch. As the richest source of characterization available, the troparion supplies his profile in the absence of a narrative vita.
He is also recorded on the Holy Trinity Orthodox calendar under the transliteration 'Eutykhias, Bishop of Meletineia,' confirming his episcopal rank and martyrdom but adding no new detail. He does not appear in OrthodoxWiki, the Prologue of Ohrid, or other surveyed reference works.