The famous composer Roland de Lassus (otherwise known as Orlando Lasso)...
>The famous composer Roland de Lassus (otherwise known as Orlando Lasso), who came from Mons and spent years in Italy before settling in Munich at the Court of Duke Wilhelm of Bavaria, used to entertain his master by writing him letters in a mix of five languages: Latin, French, Italian, German, and Spanish, with passages such as: 'Je me retrouve avec la gracieuse letterine qu'il placuit a' votre Excellence mihi scribere.' or, 'ma femme, mon petit guillaume, se porte ziemlich wohl Gott sei lob.'<
- Peter Burke (2006) The hybridization of languages in early modern Europe. European Review 14, 1: 105-110