He was a deacon from Catania in Sicily during the reign of Diocletian. During a persecution of Christians there, Euplus presented himself to the governor and proclaimed himself a Christian. While he was being tortured on the rack, the governor ordered him to worship Mars, Apollos, and Aeculapius, but he answered that he worshipped the Father, the Son and the Holy Spirit. He was beheaded in 304. His wonderworking relics are preserved in the village of Vico della Batonia near Naples.