How did Louis IX promote the use of royal money?

Louis IX promoted the use of royal money primarily through legislative enactments issued between 1263 and 1265, which sought to limit the circulation and use of baronial currency in favor of the king's own coinage.12

In addition to these restrictive measures, Louis IX implemented significant monetary reforms starting in 1262 to strengthen the royal currency system. Key aspects of these reforms included:3

• Introduction of New Denominations: In 1266, he introduced the silver gros tournois and a gold écu featuring royal lilies on a shield.3
• Standardization: These reforms helped establish a more consistent and influential royal coinage, moving away from the fragmented system of feudal deniers that had previously dominated the region.3

By curbing the influence of private baronial mints and establishing high-quality, standardized royal coins, Louis IX successfully centralized monetary authority and enhanced the prestige of the French crown's currency.132