In 1837, the Roman Catholic-supported clerical movement, the Ultramontanes, came to power in the Bavarian parliament and began a campaign of reform to the constitution, which removed civil rights that had earlier been granted to Protestants, as well as enforcing censorship and forbidding the free discussion of internal politics. This regime was short-lived due to the demand by the Ultramontanes of the naturalization of Ludwig I's Irish mistress, Lola Montez, a notorious courtesan and dancer, which was resented by Ludwig, and the Ultramontanes were pushed out.