People born in Belgium are called Belgians
Part of Belgium is French-speaking, the other main part is Dutch-speaking. That does not mean that Belgium is part of France or Netherlands. Belgium is a separate, independent country. If you are born in Belgium there is a strong possibility that you are a Belgian. You could be born in Belgium, and be French, if your parents were French nationals living in Belgium at the time of your birth.
Charlotte of Belgium was born on June 7, 1840.
Albert I of Belgium was born on 1875-04-08.
Leopold I of Belgium was born on 1790-12-16.
Baudouin of Belgium was born on 1930-09-07.
Metropolitan Panteleimon of Belgium was born in 1935.
if you mean Andreas Vesalius, from Brussels in Belgium born 1514, He studied medicine in Paris
Princess Claire of Belgium was born on January 18, 1974.
Prince Amedeo of Belgium was born on February 21, 1986.
Princess Astrid of Belgium was born on June 5, 1962.
Princess Stephanie of Belgium was born on May 21, 1864.