Answer:
Charles V
Despite being a devout Catholic Charles V was acutely conscious of Papal power and it was in his interest for the Vatican to be destabilised. At the Diet of Worms Charles absolutely opposed Luther but did not rescind an undertaking that he could leave safely thus saving Luther from execution as a heretic.
Family: House of Habsburg
Step-by-step explanation:
What role did religion play in the policies of Charles V? He was a Catholic so he fought to suppress Protestantism in the German states. He was forced to allow the German princes to choose what religion they wanted after so many years of conflict.