Onesimus of Isauria is an early Christian martyr commemorated in the Eastern Orthodox calendar on March 5. According to the synaxarion tradition he lived in Palestine and was beheaded with the sword for confessing his faith in Christ.
The surviving record of his life is minimal. He is identified by the epithet "of Isauria" — a mountainous region of southern Asia Minor — while the synaxarion places him in Palestine, a pattern consistent with Isaurian Christians who lived or traveled in the Holy Land during the apostolic and immediately post-apostolic period. His name is also attested in the alternate spelling Onisius.
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Martyrdom and Commemoration
The synaxarion records only that Onesimus was beheaded with the sword for confessing Christ. No detailed account of his trial, persecutors, or the circumstances of his death survives. The Orthodox liturgical calendar dates his martyrdom to the 1st century, placing it in the apostolic or sub-apostolic era before the persecutions were formally systematized.
He is commemorated on March 5 alongside a cluster of early martyrs. These include Martyr Conon of Isauria and Martyr Nestor — fellow Isaurians — as well as several Palestinian martyrs such as Conon the Gardener of Pamphylia, Eulogius of Palestine, and Eulampius of Palestine. This grouping reflects the regional character of his veneration within the Pre-Nicene tradition.
Regional Context
Isauria, the region from which Onesimus takes his epithet, had Christian roots reaching back to the apostolic age. The Apostle Paul evangelized in Claudiopolis, the region's only Roman colony at the time, and the local church originally fell under the jurisdiction of the Patriarch of Antioch before its transfer to Constantinople in the late 7th or early 8th century.
Archaeological survey of the region by W. M. Ramsay uncovered more than fifty Greek inscriptions, the majority of them Christian and dating from the 3rd through 5th centuries, evidence of an active Christian community present from the apostolic period onward — the kind of community that produced martyrs during the early persecutions.
