Thionville (tyôNvēl´), Ger. Diedenhofen, town (1990 pop. 40,835), Moselle dept., NE France, in Lorraine. It is a center for metallurgical and chemical industries. The town was a favorite of Charlemagne. In the testament of Thionville (806) Charlemagne divided his kingdom among his sons. After being captured by the Prussians in 1870, the town remained German until 1919.
"Thionville." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (February 22, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/thionville
"Thionville." The Columbia Encyclopedia, 6th ed.. . Retrieved February 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/thionville