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Hohentwiel is an extinct volcano in the Hegau region of Baden-Württemberg in southern Germany The mountain lies to the west of the city of Singen and 20 miles (30 km) from Lake Constance. Hohentwiel began forming, along with the chain of volcanoes in the Hegau region, about 7–8 million years ago, when a layer of volcanic ash and stone was laid down. The magma consists of Phonolite. In the following millions of years, the core was opened 260 metres beneath the surface by the glaciers from the ice age. This formed the core that is now exposed, after the ensuing millions of years of erosion. The fortress, whose ruins lie on top of Hohentwiel, was constructed in 914 using stone taken from the mountain itself by Burchard III, Duke of Swabia. Originally, the Monastery of St. Georg was contained within the fortress, but in 1005 it was moved to Stein am Rhein (now in Switzerland), and the Swabian dukes lost control of Hohentwiel. In the later Middle Ages the noble families von Singen-Twiel (12th–13th centuries), von Klingen (to 1300) and von Klingenberg (to 1521) resided here. In 1521, it was passed on to Duke Ulrich von Württemberg, who developed Hohentwiel into one of the strongest fortresses of his duchy. During this time, it began to be used as a prison and in 1526, Hans Müller von Bulgenbach, a peasant commander, was imprisoned there prior to his execution.〔Miller, Douglas. Armies of the German Peasants' War 1524–1526. Oxford: Osprey Publishing, 2003.〕 The fortress resisted five Imperial sieges in the Thirty Years' War, under the command of Konrad Widerholt〔:de:Konrad Widerholt〕 between 1634 and 1648.〔Ludwig Finckh: ''Konrad Widerholt, Ein Mann in Hegau''; Silberburg Verlag, Stutgart, 1960〕 The effect was that Württemberg remainded protestant, while most of the surrounding areas returned to catholicism in the Counterreformation .〔Casimir Bumiller: ''Hohentwiel. Die Geschichte einer Burg zwischen Festungsalltag und großer Politik''. Stadler, Konstanz, 1990, ISBN 3-7977-0208-6〕 The castle served as a Württemberg prison in the 18th century and was destroyed in 1800 after being peacefully handed over by the French. Today the former fortress Hohentwiel is the biggest castle ruin of Germany. The modern city of Singen nestles at the foot of the mountain. ==See also== * List of volcanoes in Germany 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hohentwiel」の詳細全文を読む スポンサード リンク
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