Valdemar II
Banned
The language of the nobility in most of Europe was French for a long time, but has left next to no influences... which further reinforces your point.
I'm sorry has left no influency, French has had enormous influency on volacubary of most West European countries even through it was on the languages of the European nobility* for 100-200 years.
*In almost the same way English is the language of educated European today, not in the way it was the languages for the Norman nobles in England 600 years earlier.