
The son of a count, educated by the Jesuits at Viterbo and at the Roman College, he served as papal governor of Benevento and Perugia and as nuncio in Brussels. He was then Bishop of Perugia for thirty-two years and was made a cardinal in 1853. Elected at almost sixty-eight, he reigned for twenty-five years and died at ninety-three.
His encyclical Rerum novarum (1891) set out Christian principles on capital and labour and gave a strong lift to Catholic social teaching, and Aeterni Patris renewed the study of St Thomas Aquinas. He opened the Vatican Archives to scholars, wrote many encyclicals on the Rosary, encouraged devotion to the Sacred Heart, and made John Henry Newman a cardinal.
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