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Why did Philip IV of France want to tax the French clergy?

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King Philip IV — Philip IV Philip IV, detail of the statue from his tomb, 14th century; in the abbey church at Saint-Denis, France.

Philip IV of France sought to tax the French clergy primarily to fund the rising costs of his government and his military campaigns, particularly those in Gascony and Flanders.12

As the French monarchy expanded its administrative reach and engaged in costly wars, the king faced a chronic imbalance between his ordinary revenues and the expenses of the state. His legal advisors, influenced by Roman law, argued that when the state of the kingdom was endangered, the monarch held an overriding right to demand financial aid from all his subjects, including the clergy, for the purpose of national defense.12

This policy led to significant conflict with Pope Boniface VIII, who issued the papal bull Clericis laicos in 1296 to forbid such taxation without papal consent. Philip responded with retaliatory measures, eventually forcing the papacy to concede that rulers could tax the clergy without permission when they attested to the necessity of the funds.341