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Gioacchino Pecci, born in 1810, was the birth name of Pope Leo XIII. He was elected Pope in 1878 and served until his death in 1903. During his papacy, he played a significant role in modernizing the Catholic Church and promoting social justice. He issued several encyclicals, including "Rerum Novarum," which addressed the issues of workers' rights and the role of the state in society.