The subject of this research is the attitude of Metropolitan Mihailo Jovanović towards the bishops of the non-canonical hierarchy in the Kingdom of Serbia from the correspondence with the professor of the St. Petersburg Spiritual Academy, Ivan Savich Paljmov. The hierarchy of Metropolitan Teodosiје Mraović governed the Serbian Church in the period from 1883 to 1889. From the correspondence between Metropolitan Mihail and Professor Paljmov, which contains 45 letters, 10 of them mention the non-canonical hierarchy in the Kingdom of Serbia and Metropolitan Mihail’s attitude towards them. The peculiarity of this work is reflected in the fact that it uses archival material that has not been published or been the subject of scientific research until now. The aim of this paper is, through the private correspondence of Metropolitan Mihailo and Professor Ivan Savic Paljmov, to gain insight into the attitude of Metropolitan Mihailo regarding the canonicality of that hierarchy, as well as the attitude towards its members, among whom bishops Dimitrije Pavlović and Nikanor Ružičić stand out.