HUMANI GENERIS (Concerning Some False Opinions Threatening to Undermine the Foundations of Catholic Doctrine) Pope Pius XII
Encyclical Promulgated on 12 August 1950 http://www.ewtn.com/library/encyc/p12human.htm
CATHOLICAE ECCLESIAE (On Slavery in the Missions) Pope Leo XIII
Encyclical promulgated on 20 November 1890.
Not exact matches
To many people, both today and when the
encyclical was
promulgated on July 25, 1968, the notion simply defies understanding.
IN PLURIMIS (On the Abolition of Slavery) Pope Leo XIII
Encyclical of Pope Leo XIII
promulgated on 5 May 1888 The words of St. Gregory the Great are very applicable here: «Since our Redeemer, the Author of all life, deigned to take human flesh, that by the power of His Godhood the chains by which we were held in bondage being broken, He might restore us to our first state of liberty, it is most fitting that men by the concession of manumission should restore to the freedom in which they were born those whom nature sent free into the world, but who have been condemned to the yoke of slavery by the law of nations.»
Another push came from an
encyclical the Catholic Church
promulgated in 2015.