The study examines the cult of the unmercenary Saint Tryphon. Attention is paid to his folklore veneration in Bulgaria and the specifics of his iconographic depiction. The emphasis is on the examination of his image, presented in the Martyrdom as attested in two Slavonic manuscripts from the 15th century housed in the Library of the Romanian Academy, Nos. 306 and 152. The characteristics of both manuscripts are also presented, as both texts are related to the Serbian language environment. The comparison of the two texts shows a complete coincidence in the narrative. The plotline of the narrative has classic features for this genre: introduction, main part, and a short conclusion. The main part of the narrativе stands out two semantic cores: the first is the expulsion of demons from the daughter of Emperor Gordian by Tryphon and the second is the verbal opposition between Aquilinus and the saint and the physical torture he is subjected to after each verbal struggle with his antagonist proving the strength of his spirit and the strength of the Christian faith.