Metz
There was once a city in Roman times, called Divodurum. It was the capital of a Celtic tribe called Mediomatrici.  They were called the "Mettis" for short, which is where the name "Metz" comes from. The Romans controlled this city for a long time as an important center in Gallia, but it was captured by Attila the Hun in 451. It was shortly after taken over by the Franks.