Introduction. The Evangelical Reformed Church of Lithuania as a united Reformed Church organization in Lithuania's church province can be counted from the year 1557 at the Synod in Vilnius on December 14th of that year. From that year the Synod met regularly forming all the church provinces of The Grand Duchy Of Lithuania, at first from two and later growing to six districts and representative district synods. The abbreviated name for the church is in Latin, Unitas Lithuaniae (shorter-UL) or in Polish, Jednota Litewska (Union of provincial Church in Lithuania). It sent its representatives to the General Polish/Lithuanian Synods; however in it's administration it was in fact a self-governing Church. The first Superintendent was Rev. Simonas Zacijus (Szymon Zacjusz, approx 1507-1591). In 1565 the anti- Trinitarian Lithuanian Brotherhood who rejected the learning of the Trinity separated from UL. The UL parish network covered nearly all of The Grand Duchy of Lithuania. Its district centers were Vilnius, Kedainai, Biržai, Slucke, Kojdanove and Zabludove later Izabeline. The Church in Lithuania grew weaker due to the effects of war and the counter-reformation. Up until the Second World War, The Reformed Church in Lithuania had about 10,000 believers. Now the Church has over 7,000 believers with parishes in Biržai and Biržai region, Vilnius, Kedainai, Klaipeda and the other large towns. The UL has, since 1924, been a WARC member and also maintained relations with the Reformed Churches in Germany, Switzerland, France, Poland, Hungary, Sweden, Scotland, The Netherlands and The U.S.A. The Highest institution of The UL is the Synod consisting of the pastors (kunigai), catechists called also deacons (katechetai, diakonai), the secular, senior curates (kuratoriai) and delegates (delegatai) from the evangelical reformed congregations. An inter Synod institution works during the time between synod assemblies in Biržai consisting of the Consistory and the senior minister, the church (general) superintendent. Ministers are trained in the University of Klaipėda and abroad.