Philips of Marnix, lord of Saint-Aldegonde (Dutch: Filips van Marnix, heer van Sint-Aldegonde) (1538 - 15 December 1598), was a Flemish and Dutch writer and statesman, and the probable author of the text of the Dutch national anthem, the Wilhelmus. He was born at Brussels, the son of Jacob of Marnix, baron of Pottes.

The above text was taken from Wikipedia.org, and you can find more about de Marnix at the following web address: http://en.wikipedia.org/wiki/Philips_of_Marnix,_lord_of_Saint-Aldegonde