The article presents the main directions of research on the medieval cathedral and collegiate clergy - i.e. prelates, canons, vicars, residences and altarists, especially in the Archdiocese of Gniezno. The most important monographs of the same ecclesiastical environment in the Prussian dioceses of the Archdiocese of Riga and very rare works of this type concerning the Archdiocese of Lviv were taken into account as comparative material. Polish research on the chapter clergy dates back to the beginning of the 19th century, when the first monographic works were written, presenting the composition of some Polish cathedral chapters (including those in Krakow and Gniezno). They initiated a certain historiographic type, which consisted in presenting biographies of individual members of each church institution - not only for the Middle Ages, but for the entire period of its functioning. At least until World War II, there were no changes in Polish research in this respect: in the area of social sciences, it did not go beyond simple biographical studies and censuses of clergy. After World War II, work on the legal order appeared in Polish historiography, following the example of German historiography in the first decades of the 20th century. There were also compilations of lists of staff of collegiate chapters, the main purpose of which was to present the biographies of their members, and constituted a continuation of the biographical trend initiated in the 19th century. In addition to the trends mentioned above, in Polish post-war historiography one can notice the progressive development of research on legal systems and the development of classic prosopographic research: their goal is not only a simple biography, but also the characterization of the social group of prelates and canons - presenting their social and territorial ties, upbringing and principles of promotion. in the church hierarchy. Polish research on the capitular clergy to date is definitely insufficient. Contemporary analytical prosopographic studies are particularly needed - both in relation to cathedral chapters and, perhaps even above all, collegiate chapters. Research on the clergy of the lower chapter is particularly neglected. Taking into account the current state, an attempt should be made to collectively catalog the catalogs of members of Polish cathedral and collegiate chapters as part of the planned "Polonia Sacra" series.