Why did Louis IX oppose the expansion of clerical courts?

Louis IX was a deeply pious ruler who maintained a sympathetic view of the clergy rooted in his own conservatism and faith. However, he was also a firm master of his realm who sought to consolidate royal authority and ensure order.

While he respected the church, he opposed efforts to expand clerical jurisdictions because he acted as a strong, centralizing monarch who prioritized the reach and authority of the royal government. His reign was characterized by the maturation of administrative and judicial systems, and he consistently worked to limit competing sources of power—whether baronial or clerical—to ensure that royal justice and influence remained supreme.12