Their Witness
The Orthodox synaxarion summary records that Hermes, Serapion, and Polyaenus distinguished themselves by their zeal in spreading the faith and in answering the polemics of the pagans. They were subsequently arrested and brought before the authorities, where they remained firm in their profession of faith and so suffered martyrdom.
The Roman Martyrology, in its entry for August 18, names 'the holy martyrs Hermas, Serapion, and Polyaenus' and states simply that they suffered death at Rome for the faith. A traditional detail preserved in that source relates that, being dragged through narrow, stony, and craggy places, they yielded up their souls to God. Some sources give the first name as 'Hernias' rather than 'Hermes,' reflecting variation in the manuscript tradition.