As a tutor to Carlos I of Spain (afterwards Emperor Charles V), Guillaume became the power behind the Spanish throne during his pupil's minority, obtaining for himself the titles of Marquis of Aerschot and Duke of Soria and Archi.
Guillaume became the power behind the Spanish throne during his pupil's minority. This was as a tutor to Carlos I of Spain (afterwards Emperor Charles V). Guillaume was obtaining for himself the titles of Marquis of Aerschot and Duke of Soria and Archi. This was as a tutor to Carlos I of Spain (afterwards Emperor Charles V).