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Why did Richelieu lay siege to La Rochelle?

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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 laid siege to La Rochelle in 1627–1628 primarily to dismantle the Huguenot political and military power that he viewed as a "state within a state".12

To Richelieu, the existence of a community with its own administrative structure, major cities, and significant military force constituted a fundamental threat to the stability of the French crown. His overarching goal was to make the king absolute in his kingdom to establish order, and he viewed both sin and civil disobedience as aspects of the same disorder.2

The situation escalated when Huguenot leaders, seeking to preserve their independence, became involved in the intrigues of Protestant magnates who instigated England to war with France. In 1627, the English sent the Duke of Buckingham to support a revolt in La Rochelle, which was the most important Huguenot stronghold. By capturing the city, Richelieu aimed to end the final Huguenot rebellion, thereby securing domestic stability and preventing foreign powers from exploiting internal religious divisions to undermine French authority.21