Léopold-Guillaume de Habsbourg
Roose was a close friend of Cornelius Jansen. After Pope Urban VIII condemned Jansen's work "Augustinus" (1640), Roose opposed publication of the papal bull in the Habsburg Netherlands. This contributed to his fall from favour under Archduke Leopold Wilhelm of Austria (governor general 1647–1656). He was replaced as president of the Privy Council by Charles de Hovyne on 23 December 1653.