Martyrdom at Chios
Onuphrius's death belongs to the broad movement of New Martyrs who, during the centuries of Ottoman rule, deliberately went before Muslim authorities to confess Christ, often after a period of ascetic preparation under a spiritual elder. After about four months of intense prayer, fasting, and struggle on Mount Athos, he set out for Chios in the company of the elder Gregory. By the Bulgarian account he openly denounced Muhammad and threw off the Turkish turban before the authorities; he was then beheaded on the seashore and his body thrown into the sea. The date given for his martyrdom is January 4, 1818.
Greek fathers of Mount Athos are credited with compiling the accounts of his life and the liturgical services in his honor, through which his veneration spread. He is honored both in the Bulgarian tradition, as a native of Gabrovo, and on the Holy Mountain where he was formed.