Some of the more important sources consulted in the preparation of this study and referred to in the footnotes are as follows: Źródła dziejowe (Historical Sources), Warsaw, 1883-1909, 22 vols. This is an invaluable collection of state papers, official correspondence, and particularly of statistical material regarding sixteenth century Poland. It is a mine of information to the student interested in Polish life of the sixteenth century. Volumina legum, Petersburg (Leningrod), 1859, 5 or 6 vols. This is a collection of Polish laws, covering a period of nearly five hundred years, from Casimir the Great (1333-1370) to the Partitions. Balzer, Corpus juris Polonici, an excellent supplementary collection of Polish laws, 4 vols. Wierzbowski, T., Materyały do Dziejów Piśmiennictwa Polskiego (Materials for a History of Polish Writings), Warsaw, 1904, 2 vols. A valuable collection of documentary material of a varied nature, chiefly correspondence, official and private. Theiner, Augustus, Vetera Monumenta Poloniae et Lithuaniae, gentiumque finitimarum historiam illustrantia, maximam partem nondum edita ex tabulariis Vaticanis deprompta, collecta ac serie chronologica disposita, Romae: typis Vaticanis, 1860-1864. 4 large folio vols. This collection contains much epistolary and reportorial material of great historical value emanating from papal nuncios and church dignitaries. Monumenta medii aevi historica res gestas Poloniae illustrantia. Cracoviae: sumptibus Academiae literarum Cracoviensis, 1874----, in 15 vols. Indispensable to the student of the sixteenth century. Much information of first class importance has been obtained from the following works: Zakrzewski, Wincenty, Powstanie i wzrost Reformacji w Polsce (The Rise and Development of the Reformation in Poland), Leipzig, 1870. Krasiński, Walerjan, Dzieje Reformacji w Polsce (A History of the Reformation in Poland), Warsaw, 1903. This work was published originally in English, in London, under the title of A Historical Sketch of the Reformation in Poland. Merczyng, Henryk, Zbory i Senatorowie protestanccy w Dawnej Polsce (Protestant Congregations and Senators in Old Poland), Warsaw. ---- Polscy Deiści i wolnomyśliciele za Jagiellonów (Polish Deists and Free Thinkers in the Time of the Jagiellos), Warsaw, 1911. Lorkiewicz, Antoni, Bunt Gdański w Roku 1525 (The Danzig Revolt of the Year 1525), Lwów, 1881. Warmiński, I., Andrzej Samuel i Jan Seklucyan (Andrew Samuel and John Seklucyan), Poznań, 1906. Łukaszewiez, Józef, Dzieje Kościołów wyznania helweckiego w Dawnej Polsce (A History of Calvinistic Churches in Old Poland), Poznań, 1853. Brückner, Alexander, Różnowiercy Polscy (Polish Dissidents), Warsaw, 1905. Kubala, Ludwig, Stanisław Orzechowski (Stanislaus Orzechowski), Warsaw. Kot, Stanisław, Andrzej Frycz Modrzewski (Andrew Frycz Modrzewski), Cracow, 1919. Chmielowski, Piotr, Historya Literatury Polskiej (A History of Polish Literature), Lwów-Warszawa.