The Mainz Merlon Mystery

[Mauro]

I have nothing clever to add so I'll tell you an useless anecdote  

Did you know that in Polish language a lot of names of German towns are in its Latin form? I'm not sure but it can be the only language that does it this way.
So Meinz is Moguncja in modern Polish. There is also Monachium, Norymberga, Koblencja, Brema, Wormacja, Akwizgran, Kilonia, Getynga and some other. 

It's sometimes a source of confusion but may help you to read old Latin chronicles if you are Polish 

With the same disclaimer as Rafal's.. Italian does that too: Magonza, Monaco, Norimberga, Coblenza, Brema, (no Italian name for Worms that I know of), Aquisgrana, Colonia, Gottinga. But I readily admit with Italian it's less surprising than with Polish!