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.
Rev. C. Arthur Lane Illustrated Notes on English Church History (London: Society for Promoting Christian Knowledge, 1901)
Courtesy the private collection of Roy Winkelman