Final answer:
Cardinal Richelieu, the first minister of French king Louis XIII, supported the Protestants during the Thirty Years War to undermine the power of the Habsburg family.
Step-by-step explanation:
During the Thirty Years War, the first minister of French king Louis XIII who provided funds and troops to support the Protestants, even though he was a Catholic cardinal was Cardinal Richelieu. As the chief minister, Cardinal Richelieu was eager to undermine the power of the Habsburg family, and in doing so, he saw supporting the Protestants as a way to weaken the rival family's influence.