sentences:  The current external bastions, begun in the 16th century and completed in the 17th, were added as a precaution because of fears of Turkish Invasion.The only time that the fortress actually came under siege was during the German Peasants' War in 1525, when a group of miners, farmers and townspeople tried to oust Prince-Archbishop Matthäus Lang, but failed to take the fortress.In 1617 the deposed Archbishop Wolf Dietrich von Raitenau died in the fortress prison.