A Mysterious Saint from the paintings of Princely Compartment of St. Cyril's Church of Kyiv: offense and truth of the monument itself

The purpose of the publication is to introduce into scientific circulation a fresco image of an unknown saint, created in the XII c. on the southern plane of the south-western domed pillar of the Cyril’s Church in Kyiv. Make an attempt to attribute this image, as well as critically analyze and refute unscientific knowledge products about the historical and sacred relic, which is the Kyiv Cyril’s Church. It is necessary to publish new information, views, assumptions, conclusions, which, in our opinion, have a scientific novelty. Research methods were selected in accordance with the purpose based on the principles of objectivism, proper scientific assessment, comparison. The method of analysis, induction and deduction was mainly used to interpret the sacred fresco of Cyril’s Church. Conclusions. As a result of the research, an assumption was made about the attribution of the image of an unknown martyr in the frescoes of Cyril’s Church as St. Prince Borys the Marytr, arguments for refuting false information about the object under study were presented, knowledge about the history and painting of a unique monument of the XII c. ‒ Cyril’s Church in Kyiv was added