Which preposition to use with mayence

at Occurrences 2%

We reached Mayence at 4 o'clock p.m., and I went to put up at the three Crowns (Drei-Kronen).

in Occurrences 2%

Charlemagne remained all the winter at Aix-la-Chapelle, spent the first months of the year 800 on affairs connected with Western France, at Rouen, Tours, Orleans, and Paris, and, returning to Mayence in the month of August, then for the first time announced to the general assembly of Franks his design of making a journey to Italy.

on Occurrences 2%

Bieberich, a superb palace belonging to the Dukes of Nassau on the right bank, next presents itself to view on your left ascending; to your right, at a short distance from Bieberich, you catch the first view of Mayence on the left bank, with its towers and steeples rising from the glade.

Which preposition to use with  mayence