Originally Posted by ysbel
I also wondered if he and Leopold was multilingual in German and French (because of their Bavarian mother) or whether they spoke just French. I imagine that knowing German could have helped them with Flemish.
My grandfather and his brother, who knew Charles well at the time he was living at Raversijde, told me that he spoke German and Dutch fluently, both with a slight French accent. It was clear from both his French and his Dutch pronunciation that he spoke the Belgian (i.e. Walloon and Flemish) standard varieties of these languages. He was also able to communicate in the local West-Flemish dialect. His brother the king was said to have spoken Dutch less fluently, more slowly, and in a more formal register.