The Coburg Castle taken from the city of Coburg. One of Germany's largest castles, the mighty Veste Coburg citadel, built starting in 1225 (upon the site of an 11th century chapel), dominates the town from its hilltop. During the Diet of Augsburg in 1530 reformer Martin Luther spent six months at the castle (located at the southernmost point of the Saxon duchy) while his liege lord, the Duke of Saxony, attended the Diet. Luther was forbidden to attend by the duke, who feared that he would be imprisoned and burned as a heretic. While quartered at the castle Luther continued with his translation of the Bible into German.