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Now known as Mainz Cathedral. Originally St. John's Church, then St. Salvator, consecrated in 911 by Archbishop Hatto I, served as the cathedral for the Bishop of Mainz until the appointment of Willigis as Archbishop of Mainz in 975.

Mayence Cathedral

Now known as Mainz Cathedral. Originally St. John's Church, then St. Salvator, consecrated in 911 by…