Amongst the surviving murals in the Church of Archangel Michael in the Monastery near the village of Dolna Beshovitsa is a preserved frieze with medallions of hierarchs. According to the inscriptions on part of them, they depict bishops of the Roman church. These are Pope Sylvester, Pope Hadrian as well as one more hierarch, whose inscription is only partly preserved (here the name is read as Pope Agatho). The main hypothesis the paper discusses is related to the depiction of Pope Hadrian – his presence in the altar space of the church, the possible answers to the questions: why exactly Pope Hadrian and his links to two of the images of hierarchs in the southern procession of Melismos, which are supposed to present St. Constantine-Cyril the Philosopher and St. Methodius. Furthermore, particular textual sources for the depiction of the Roman bishop are commented on, which expectedly are limited to the hagiographical texts of both brothers, because Pope Hadrian II is not part of the hierarchs listed in the Synaxaria. An assumption has been made about the existence of a common hagiographic source according to the hypothetical depiction of Pope Agatho. The depictions of Roman bishops in the Church of Dolna Beshovitsa, atypical for the post-Byzantine churches, apart from that of St. Sylvester, raises the question about the mechanisms of inclusion of bishops in the altar programmes and the integration of images in the general scheme of connotations, established through the choice of certain hierarchs, and the possibilities this particular system not just to reconstruct, but also to generate novel ones in a new context.