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Pope Francis’s visit to the United States has drawn attention to Popes and papal history. Francis himself has been pictured on many stamps (the United States Postal Services is the world’s only postal service adhering to the tradition of not picturing living people on its stamps), as have his recent predecessors. But the commemoration of Popes and Papal history goes so far that even St. Peter, the first Pope and one of the twelve Apostles, has been commemorated on stamps. It would be fun to create a collection that tries to find as many different Popes on stamps as possible.