Mariology of the popes John Paul II), visits to Marian shrines (Benedict XVI in 2007) and by actively supporting the fathers of Vatican II as they highlighted the importance of Marian veneration (Popes John XXIII and Paul VI) in "Lumen gentium". Popular views like the Assumption and the Immaculate Conception developed into papal teaching over time. Popes have also limited and cautioned against some devotional practices. In 1674 Pope Clement X (1670–1676) indexed books on Marian piety. After the Council of Trent, "Marian fraternities" were founded, fostering Marian piety, not all of which were approved. Not all Popes took the same view on Marian
Christianity in the 19th century prayers, initiatives, and the acceptance and support of Marian congregations. Since the 19th century, popes began to use encyclicals more frequently. Thus Leo XIII, the Rosary Pope, issued eleven Marian encyclicals. Recent popes promulgated the veneration of the Blessed Virgin with two dogmas: Pius IX with the Immaculate Conception in 1854, and the Assumption of Mary in 1950 by Pope Pius XII. Pius IX, Pius XI, and Pius XII facilitated the veneration of Marian apparitions such as in Lourdes and Fátima. The Second Vatican Council highlighted the importance of Marian veneration in "Lumen gentium". During the Council, Paul VI proclaimed