"Pope Leo XIII (Italian: Leone XIII; born Vincenzo Gioacchino Raffaele Luigi Pecci[a]; 2 March 1810 – 20 July 1903) was head of the Catholic Church from ...
20 February 1878 to his death. He was the oldest pope (reigning until the age of 93), and had the third-longest confirmed pontificate, behind those of Pius IX (his immediate predecessor) and John Paul II.
He is well known for his intellectualism and his attempts to define the position of the Catholic Church with regard to modern thinking. In his famous 1891 encyclical Rerum novarum, Pope Leo outlined the rights of workers to a fair wage, safe working conditions, and the formation of trade unions, while affirming the rights of property and free enterprise, opposing both socialism and laissez-faire capitalism. He influenced Mariology of the Catholic Church and promoted both the rosary and the scapular." - (en.wikipedia.org 30.01.2020)