From the Holocaust Museum:
Book burning has a long and dark history; and perhaps the most famous of these events, the burning of books under the Nazi regime on May 10, 1933, had a precedent in nineteenth century Germany. In 1817, German student associations (Burschenschaften) chose the 300th anniversary of Luther’s 95 Theses to hold a festival at the Wartburg, a castle in Thuringia where Luther had sought sanctuary after his excommunication. The students, demonstrating for a unified country—Germany was then a patchwork of states—burned anti-national and reactionary texts and literature which the students viewed as “Un-German.”