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This April 24, 2005 photo shows Vatican master of Ceremonies Archbishop Piero Marini, not pictured, adjusting the skullcap of Pope Benedict XVI during his installment Mass in St. Peter's Square at the Vatican. Pope Benedict XVI said Monday, Feb. 11, 2013 he lacks the strength to fulfill his duties and on Feb. 28 will become the first pontiff in 600 years to resign. The announcement sets the stage for a conclave in March to elect a new leader for world's 1 billion Catholics. (AP Photo/Pier Paolo Cito)