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What earlier social encyclical did Mater et magistra mark the anniversary of?
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St. John XXIII
Pope John XXIII said the goal of his papacy was to “bring the church up to date” and regenerate Catholic faith.
Mater et magistra, issued by Pope John XXIII in 1961, marked the 70th anniversary of the foundational social encyclical Rerum novarum, which was originally promulgated by Pope Leo XIII in 1891.1