Johann Jacob Quandt (1686–1772), professor primarius of theology at the University of Königsberg, chief court preacher, and General Superintendent of Prussia, is known as a publisher of Lithuanian books, supervisor of the Lithuanian Language Seminar, and a historiographer of Lithuanian writings. Quandt made his name as one of the first historiographers of Lithuanian writings by German forewords in Lithuanian books published under his guidance, the first printed Bible (11735), hymnal Iß naujo pérweizdėtos ir pagérintos Giesmû-Knygos (11732) and postil Trumpas ir prástas Ißguldimas wissû Nedėlês ir ßwentû Dienû Ewangeliû (11750). The article deals with the information on Lithuanian writings presented by Quandt in the manuscript Preußische Presbyterologie (Prussian Presbyterology, before 1772), which is currently stored in Berlin, in the Secret State Archives Prussian Cultural Heritage Foundation (GStA PK: XX. HA Hist. StA Königsberg, Hs, Nr. 2, Bd. 1–5).