This leader's main antagonist dubbed this person a  "pest on the whole of Christianity" and offered a massive bounty on this person's head, which led to the (*) first  assassination of a head of state with a firearm.
This person politically supported Francis, Duke of Anjou as a would-be hereditary ruler and physically supported Charles V during that man's abdication by literally offering a shoulder for Charles to lean on while abdicating. This person  became involved in a conflict following Margaret of Parma's grant of toleration after a wave of anti-Catholic iconoclasm  known as the "Beeldenstorm" resulted in the formation of a tribunal. This leader's main antagonist dubbed this person a  "pest on the whole of Christianity" and offered a massive bounty on this person's head, which led to the (*) first  assassination of a head of state with a firearm. This person opposed the founder of the Council of Blood, the Duke of Alba, who  served as the governor of the United Provinces under this person's enemy, Philip II. For 10 points, Balthasar Gerard killed what  Prince of Orange who led the Dutch revolt that began the Eighty Years' War?
This person politically supported Francis, Duke of Anjou as a would-be hereditary ruler and physically supported Charles V during that man's abdication by literally offering a shoulder for Charles to lean on while abdicating.
William the Silent [or William I; or Willem de Zwijger; prompt on William of Orange; prompt on William or Willem]