Solemnity of the Sacred Heart
Encyclicals and relevant documents in the Church

1856 Feast of the Sacred Heart instituted in the Church by Pope Pius IX

Three Encyclicals centered on the Sacred Heart

1899 - Annum Sacrum
Annum Sacrum is an encyclical by Pope Leo XIII on the consecration of the entire world to the Sacred Heart of Jesus. It was delivered in Saint Peter's Basilica in Rome on the 25th day of May, 1899, the twenty-second year of his pontificate.
http://www.vatican.va/content/leo-xiii/en/encyclicals/documents/hf_l-xiii_enc_25051899_annum-sacrum.html

1928 - Miserentissimus Redemptor
Miserentissimus Redemptor is the title of an encyclical by Pope Pius XI, issued on May 8, 1928. This encyclical deals with the concepts of Acts of Reparation to the Sacred Heart and atonement.
http://www.vatican.va/content/pius-xi/en/encyclicals/documents/hf_p xi_enc_19280508_miserentissimus-redemptor.html

1956 - Haurietis Aquas
Haurietis Aquas is a landmark encyclical of Pope Pius XII on devotion to the Sacred Heart. Written on May 15, 1956, it was attached to the 100th anniversary of the establishment of the feast of the Sacred Heart of Jesus by Pope Pius IX.
http://www.vatican.va/content/pius-xii/en/encyclicals/documents/hf_p-xii_enc_15051956_haurietis-aquas.html

1999 – Message on the Centenary of the consecration of mankind to the Sacred Heart of Jesus
St John Paul II in Message on the centenary of the consecration of mankind to the Sacred Heart of Jesus(1999), in L’Osservatore Romano, 12 June 1999.
In his Message it is affirmed that Devotion to the Sacred Heart was an essential component of Pope John Paul II‘s hopes for the “new evangelization” called for by the Church. “For evangelization today,” he said, “the Heart of Christ must be recognized as the heart of the Church.

​https://www.ewtn.com/catholicism/library/his-heart-is-the-heart-of-the-church-8221