The Schwarzenau Brethren, the German Baptist Brethren, Dunkers, Dunkards, Tunkers, or sometimes simply called the German Baptists, are an Anabaptist group that dissented from Roman Catholic, Lutheran and Reformed European state churches during the 17th and 18th century. German Baptist Brethren emerged in some German-speaking states in western and southwestern parts of the Holy Roman Empire as a result of the Radical Pietist revival movement of the late 17th and early 18th centuries.