Saint Onuphrius of Gabrovo — in the world Matthew — was a Bulgarian Orthodox monk and new-martyr who suffered under Ottoman rule. He was born about 1786 at Gabrovo in central Bulgaria, then within the Tarnovo diocese of the Ottoman Empire, and grew up in an Orthodox family, drawn from youth to the faith.
Seeking a deeper spiritual life, he went as a young man to Mount Athos and entered the Serbian monastery of Hilandar, a major center of Slavic Orthodox life, where he received his monastic formation. He was tonsured a monk with the name Manasses and later took the great schema with the name Onuphrius.
After a period of intense prayer, fasting, and preparation, he set out with the elder Gregory of the Peloponnese for the island of Chios. There he openly confessed Christ before the Ottoman authorities and refused every pressure to embrace Islam; he was seized, cruelly tortured, and on January 4, 1818, beheaded on the seashore, his body cast into the sea.
Local Christians preserved the memory of his confession, and his veneration spread within the Bulgarian Orthodox Church and among the Athonite communities. He is distinct from the earlier hieromartyr Damascene of Gabrovo, with whom his home town is also associated.