Yvon Beaudoin gives us the context:
On the very day of Napoleon’s abdication on April 6, 1814, the Senate called to the throne the Count of Provence who already had taken the title Louis XVIII. Initially, he reigned one year (First Restoration). In point of fact, upon Napoleon’s return (May-June 1815, the Hundred Days), the king fled to Belgium. A new European coalition compelled Napoleon to abdicate anew. As soon as Napoleon was exiled to the island of Saint Helena, Louis XVIII returned to Paris on July 8… Louis XVIII reigned until his death which took place September 16, 1824. Just as in other dioceses, through letters to the parish priests and in pastoral letters, the Mazenods called for prayers for the king during his illness and death and, subsequently, each year through an anniversary service.
The Count of Artois, Louis XVIII’s brother, succeeded him under the name Charles X. During his reign, the liberals became ever more powerful. In 1828-1829, Martignac, the Prime Minister, in order to bring together those who were left leaning and the liberals, granted them concessions to the detriment of the Church. He appointed a layman as head of the University. He forbade religious orders, especially the Jesuits, to teach. He set a 20,000 limit on the students in the minor seminaries, etc. (Ordinances of 1828)
The Mazenods mention the king often in their correspondence and their intense opposition to the ordinances of 1828, that of April 21 which deprived the bishops of the oversight and the direction of grade schools and that of June 16 on secondary schools, which forbade religious to teach, limited the number of students in the minor seminaries and established a rule that was in conflict with the rights of the bishops.