Martyrdom
The traditional account describes Mertius as a soldier of a Mauretanian battalion who was denounced as a Christian and led before the emperor. Commanded to offer sacrifice to the idols and refusing, he was deprived of his soldier's belt, the visible token of his military standing, before being handed over to the torturers.
The synaxarion relates that he was beaten with wooden rods and his flesh was torn, but that he made no cry under the suffering, a fortitude said to have astonished his persecutors. He was confined to prison, and the sources record that he died there from his wounds and from hunger. By one account, after eight days a discharge issued from his wounds and, overcome by the pain, he died in custody.