Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
One resident of this city condemned wayward wives for making their husbands impotent by baking bread from wheat and honey smeared on the wives' naked bodies; that passage is contained in the Corrector sive Medicus, the 19th volume in a collection of 20 books on church government written by Burchard, an 11th century bishop of this city. An agreement reached in this city provided for the reception of the regalia "through the sceptre"; that agreement reached between Callixtus II and emperor Henry V was the 1122 concordat of this city that brought a halt to the investiture controversy. In the Nibelungenlied, this city is the location of the Burgundian court. Along with Speyer and Mainz, it is home one of the three imperial cathedrals of the Rhineland. In a later meeting at this city, Johann Eck, assistant to the Archbishop of Trier, asked a question which drew the response "my conscience is captive to the word of God. I cannot and will not recant anything." For 10 points, what German city was visited by Charles V and Martin Luther during a 1521 Diet
A:
History