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Priests sing and dance in Saint Peter's Square at the Vatican on Saturday. Popes John XXIII and John Paul II will be declared saints by Pope Francis at an unprecedented twin canonization on Sunday.

Priests sing and dance in Saint Peter's Square at the Vatican April 26, 2014. Pope John XXIII, who reigned from 1958 to 1963 and called the modernizing Second Vatican Council, and Pope John Paul II, who reigned for nearly 27 years before his death in 2005 and whose trips around the world made him the most visible pope in history, will be declared saints by Pope Francis at an unprecedented twin canonization on Sunday. REUTERS/Tony Gentile (VATICAN - Tags: RELIGION TPX IMAGES OF THE DAY)Tony Gentile / Reuters