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Workers remove a painting of Pope Benedict XVI from the press conference room after the head of Spain's Catholic Church and President of the Bishops' Conference Cardinal Antonio Maria Rouco Varela addressed a news conference in Madrid

Workers remove a painting of Pope Benedict XVI from the press conference room after the head of Spain's Catholic Church and President of the Bishops' Conference Cardinal Antonio Maria Rouco Varela addressed a news conference in Madrid February 11, 2013. Pope Benedict shocked the world on Monday by saying he no longer had the mental and physical strength to cope with his ministry, in an announcement that left his aides "incredulous" and will make him the first pontiff to step down since the Middle Ages. REUTERS/Susana Vera (SPAIN - Tags: RELIGION POLITICS TPX IMAGES OF THE DAY) - RTR3DNAY

World reacts to Pope's resignation

Pope Benedict left the Catholic world in shock after becoming the first pontiff since the Middle Ages to resign his office, saying that failing strength had left him unable to lead the church through a period of relentless change and turmoil.