of Henneberg and was initially regarded by them as a Saxon outpost within Franconia. 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, John, Elector of Saxony, attended the Diet. Luther was forbidden to attend by the Elector, 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. In 1547, the princely residence was moved from the Veste to a former monastery, rebuilt as a Renaissance palace, the Ehrenburg. 17th century to early 20th century In 1596, Coburg was raised to the status of capital of one of the dynasty's splintered Saxon-Thuringian territories, the newly created Duchy of Saxe-Coburg under the leadership of Duke John Casimir (ruled 1596–1633). From 1699 to 1826, it was one of the two capitals of the Duchy of Saxe-Coburg-Saalfeld, and from 1826 to 1918 it was a capital of the Duchy of Saxe-Coburg-Gotha. Ernest Frederick, the fourth Duke of Saxe-Coburg-Saalfeld, moved his capital from Saalfeld to Coburg in 1764. Coburg then became capital of the Duchy of Saxe-Coburg-Saalfeld and later of the Duchy of Saxe-Coburg and Gotha. In the early 19th century, the town's medieval fortifications were demolished and replaced by parks. The duke also started the collection of copperplate engravings that is today part of the Veste Coburg museum. Under his son, Ernest, the with what is today the Landestheater Coburg was created. He also rebuilt the Ehrenburg in Gothic revival style. In the mid-19th century, Duke Ernest II supported national and liberal ideas and Coburg hosted the first meeting of the German National Association, the founding of the and the first (national sports festival). During the 19th century, dynastic marriages created ties with the royal families of Belgium, Bulgaria, Portugal and Britain. This turned the ducal family from the rulers of a fairly obscure backwater duchy into one playing an influential role in European politics. The era of political influence peaked with Leopold Frederick; born Prince of Saxe-Coburg-Saalfeld, becoming the King of Belgium in 1831 and Prince Albert of Saxe-Coburg and Gotha, born in Schloss Rosenau, marrying his first cousin, Queen Victoria in 1840. The marriage between Albert and Victoria established the present British royal house, which renamed itself Windsor during World War I. This marriage