Nikolaus Ludwig, Reichsgraf von Zinzendorf und Pottendorf was a German religious and social reformer, bishop of the Moravian Church, founder of the Herrnhuter Brüdergemeine, Christian mission pioneer and a major figure of 18th-century Protestantism.

The Moravian Church, or the Moravian Brethren, formally the Unitas Fratrum, is one of the oldest Protestant denominations in Christianity, dating back to the Bohemian Reformation of the 15th century and the Unity of the Brethren founded in the Kingdom of Bohemia, sixty years before Luther's Reformation.