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Leo XIII, , original name Vincenzo Gioacchino Pecci, (born March 2, 1810, Carpineto Romano, Papal States—died July 20, 1903, Rome), head of the Roman Catholic Church (1878–1903) who brought a new spirit to the papacy, manifested in more conciliatory positions toward civil governments, by care taken that the church not be opposed to ...

Pope Leo XIII reigned from February 20, 1878 to July 20, 1903. To our Institute members, he is most affectionately admired for a great many reasons, perhaps most especially for his authorship of the Prayer to St. Michael, his eleven encyclicals on the Rosary, and those on Catholic social teaching.

He was first destined for Spoleto, but on 17 July, 1841, he was sent to Perugia, a hotbed of the anti-papal revolutionary party. For three years he improved the material conditions of his territory and introduced a more expeditious and economical administration of justice.

Leo PP. XIII Gioacchino Pecci 20.II.1878 - 20.VII.1903. LEO XIII. Apostolic Constitutions; Apostolic Letters; Briefs; Bulls

Pope Leo XIII (Latin: Leo PP. XIII; Italian: Leone XIII, March 2, 1810—July 20, 1903), born Vincenzo Gioacchino Raffaele Luigi Pecci, was an Italian priest of the Roman Catholic Church and the 257th Pope from 1878 until his death.