The reformation was a very complicated process which coffected all spheres of social and personal life. Its research can be carriet out in many scietific studies and its importance can be reflected upon from different points of view. The trend of the reformation which developed in Switzerland is colled differently in different historical sources: helvetian after the old name of Switzerland (Helvetia); Calvinizm, after the name of a famous religions reformer J.Calvin. The Calvinist church in the Grand Dutchy of Lithuania was colled the Evangelical Reformed Church, in short-the reformed Church. Since its establishment in 1555 the Evangelical reformed Church was independent. The activities and the relationship of the Evangelical reformed Church with Lithuanian state during the period of independence in 1918-1940 is analized in this thesis, the main part of the thesis is devoted to the analysis of the self-govermment of the Evangelical reformed Church, which is the fundamental thing in the reformed Church. The reformed Church has never been governed by a hierarchic structure. Its higest self-governing institution was the Synod. The analysis shovs how the Synod of the Reformed Church independently, without direct interference of the state and without demand for special conditions managed to reorganize its administration and territorial network, retaining self-governing, real property and cult buildings under the changed political circumstances 9after Vilnius, the... [to full text]