Archeographic heritage of a scientist-reformat Stanislaw Dominik Kleczewski (1714–1776) in the fonds of the Institute of Manuscript of V. Vernadsky National Library of Ukraine

The author has investigated the manuscripts of Stanislaw Dominik Kleczewski (1714–1776), a Polish reformat-scientist, the author of works written during Enlightenment. The analyzed manuscripts are deposited in the fonds of the Institute of Manuscript of V. Vernadsky National Library of Ukraine. Documents from the archive of the Russian province reformats and biobliographic literature helped us to reconstruct S. Kleczewski biography and evaluate his scientific activity and clerical career. We have accentuated the role of S. Kleczewski in the acceleration of the province convention libraries acquisition. We have also revealed and attributed the autographs of his works in biblical history "Diluvio universale" and "Theocratia albo wielmożność dzieł boskich…", defined their contents and archeographic features. Bibliographic sources that S. Kleczewski used and their location in the libraries of Russian province convents are defined. The manuscript version of S. Kleczewski treatise in Slavic history "Lechus historiae Polonae restitutus" is analyzed, its specifics and textological divergences in comparison with the exemplar of Olomouc edition of 1774 are defined. A large complex of previously unknown manuscript sources from the fonds of the Institute of Manuscript of VNLU is introduced