How did Louis IX’s reforms strengthen royal justice in France?

Louis IX strengthened royal justice in France through several key administrative and judicial reforms that centralized authority and increased the crown's oversight.12

• Development of Parlements: By approximately 1250, the judicial sessions of the king's court, known as the curia regis, began to be recorded centrally and were increasingly referred to as parlements. These sessions derived growing jurisdiction from the king’s reputation, allowing the crown to hear appeals against the judgments of local royal officials, such as baillis and seneschals.13
• Administrative Oversight: To address abuses of power by local officials, Louis IX appointed commissions of investigation starting in 1247. These investigators provided a mechanism for redress, ensuring that royal agents acted in accordance with the king's will.12
• Statutory Reform: Louis was the first French king to express his will regularly through formal statutes. His 1254 ordinance for administrative reform was a direct result of these remedial inquiries.12
• Encroachment on Baronial Jurisdiction: Louis consistently sought to limit the power of lay nobles to cause disorder. He allowed royal officials to encroach upon baronial jurisdictions and actively welcomed appeals from baronial judgments to the royal court.12