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Why did Richelieu subsidize Gustavus Adolphus during the Thirty Years’ War?

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Full-length portrait of Cardinal Richelieu by Philippe de Champaigne, showing him in red clerical robes holding a red book, standing beside a balustrade with a draped curtain behind. — Cardinal Richelieu As both statesman and churchman, Cardinal Richelieu was the acknowledged architect of France's greatness in the 17th century. In 1640, when this full-length portrait was painted (likely by Philippe de Champaigne), he was embroiled in a dispute with the pope and other religious controversies along with many other consequences of expanding French power across Europe. He would die two years later, facing conspiracies against his life and suffering ill health.

Cardinal Richelieu subsidized Gustavus Adolphus of Sweden during the Thirty Years’ War as part of his broader foreign policy objective to restore the European balance of power and counter Habsburg hegemony, which threatened French independence of action.1

Following the Habsburgs' military successes and the Edict of Restitution in 1629, which intensified religious tensions, Richelieu sought to weaken the influence of the Holy Roman Empire. By providing financial support to the Swedish king, Richelieu aimed to create a diversion that would preoccupy the Habsburg forces and prevent them from dominating the empire. Although this strategy ultimately led to the war spilling over the Rhine and drawing France into direct conflict, it was rooted in the cardinal's pragmatic, state-centered approach to politics, which prioritized national security and the containment of rival powers over religious alignment.1