Unity of the Brethren (Czech Republic) influenced by Bohemian Reformation
The Unity of the Brethren (Czech: Jednota bratrská) is the Ecclesiastical province of the Moravian Church in the Czech Republic. 
It is  the oldest province of the Moravian Church. and part of the religious movement Unity of the Brethren.The movement was originally started by a Catholic priest named Jan Hus in approximately 1405 as part of the Bohemian Reformation, making it one of the oldest Protestant denominations in Christianity.  Hus is considered by some to be the first Church reformer, although some believe this to be John Wycliffe.Hus opposed many aspects of the Catholic Church in Bohemia, including the Bohemian view of ecclesiology, simony and the Eucharist. He established a new group as a reaction to these practices and attempted to return the Church in Bohemia and Moravia to the practices of early Christianity. The movement gained royal support for a time but was eventually forced to be subject to Rome. Some of his followers publicly recognised Rome’s authority; however, the remaining Hussites continued to operate outside Roman Catholicism and, within fifty years of Hus's death, had become independently organized as the 'Bohemian Brethren' or Unity of the Brethren. 
This group maintained Hussite theology (which later leaned towards Lutheran teachings). The first Brethren's Church was founded in Kunvald, Bohemia, in 1457.