This edition contains the first three encyclicals promulgated by Pope St. Pius X: E Supremi (On the Restoration of All Things in Christ), Ad Diem Illum Laetissimum (On the Immaculate Conception), and Iucunda Sane (On Pope Gregory the Great). These encyclicals, issued during 1903 and 1904, are clear, concise, and packed with the power that characterized the best of Pius's writings.