… but non-German speakers might enjoy the images
In the book chats we recently talked about Roman Mainz – see my web page – when we discussed Eagle in the Snow by Wallace Breem, and earlier this month The Iron Hand of Mars by Lindsey Davis.
The German Wikipedia page Mogontiacum (as usual handle with care) is a comprehensive one, though it says that it still needs editing ("bearbeiten"). It includes a list of the legions that were stationed in Moguntiacum.
The first image on the page is a section of the Tabula Peuteringiana (see also here and at livius.org) showing the area including Roman Mainz, courtesy Wikimedia Commons: click on image and look for the red arrow pointing to "Mongontiaco":
I'm still trying to find a list of the various types of pictorial symbols on the map. Assistance is greatly appreciated.