Pope Benedict XVI wears a Saturno hat as he leaves at the end of his Wednesday general audience in Saint Peter's Square at the Vatican, June 3, 2009. Pope Benedict said on February 11, 2013 he will resign on Feb 28 because he no longer has the strength to fulfill the duties of his office, becoming the first pontiff since the Middle Ages to take such a step. Giampiero Sposito//Reuters
Pope Benedict XVI waves as he arrives for the Immaculate Conception celebration prayer in Piazza di Spagna (Spain's Square) in downtown Rome, December 8, 2011. Alessandro Bianchi//Reuters
Pilgrims cheer and sing as they wait at the site where Pope Benedict XVI will give a Mass in Bicentennial Park near Silao, Mexico, March 25, 2012. Dario Lopez-Mills/AP
Pope Benedict XVI waves from the popemobile wearing a Mexican sombrero as he arrives to give a Mass in Bicentennial Park near Silao, Mexico, March 25, 2012. Eduardo Verdugo/AP
Pope Benedict XVI meets with Fidel Castro in Havana, March 28, 2012. Osservatore Romano/AP
Pope Benedict XVI walks through Auschwitz's notorious gate during his visit to the former Nazi death camp May 28, 2006. Calling himself 'a son of Germany,' Pope Benedict prayed at the former Nazi death camp of Auschwitz and asked why God was silent when 1.5 million victims, mostly Jews, died in this 'valley of darkness.' Alberto Pizzoli/Reuters
Pope Benedict XVI leaves at the end of a meeting with seminarians at the Romano Maggiore seminary in Rome February 8, 2013.
Larissa stands beside a portrait of Pope Benedict, painted with a cloak and skull cap bearing Cameroon's national colors, outside the Mary Queen of Apostles Basilica in Yaounde March 15, 2009, where Pope Benedict celebrated vespers. Pope Benedict made his first trip to Africa, starting in Cameroon, where he urged developed nations grappling with the economic crisis not to forget the continent where survival is a daily struggle for millions. Finbarr O'Reilly/Reuters
Pope Benedict XVI offers a nun the Holy Communion during a Chrism Mass inside St. Peter's Basilica at the Vatican, April 9, 2009. Benedict XVI celebrated a Holy Thursday Mass that included the traditional blessing of holy oils - some of which the church sent to an earthquake zone as a sign of closeness to the stricken population. Andrew Medichini/AP
Pope Benedict XVI places a note in the Western Wall, Judaism's holiest prayer site, in Jerusalem's Old City May 12, 2009. Pope Benedict visited holy sites in Jerusalem at the heart of the Israeli-Palestinian conflict as part of a pilgrimage beset by Jewish disappointment over his remarks on the Holocaust. David Silverman//Reuters
Pope Benedict XVI watches the movie 'Karol, un uomo divenuto papa' ('Karol, a man who became Pope'), to remember the late Pope John Paul II at the Vatican, May 19, 2005. Max Rossi/Reuters
Pope Benedict XVI, Cardinal Joseph Ratzinger of Germany, waves from a balcony of St. Peter's Basilica at the Vatican after being elected by the conclave of cardinals, in this April 19, 2005. Max Rossi/Reuters
Albanian-born Mother Teresa (l.) and German Cardinal Joseph Ratzinger (r.) attend a Mass during the 85th German Catholics Week in Freiburg, southern Germany, which was celebrated from Sept. 13-19, 1978. KNA/AP
German Cardinal Joseph Ratzinger, the strict defender of Catholic orthodoxy for the past 23 years, was elected Pope April 19, 2005, despite a widespread assumption he was too old and divisive to win election. He took the name Benedict XVI. He is pictured with his family in this1938 file photo. (r.-l.) His father Josef, sister Maria, mother Maria, brother Georg, and Pope Benedict XVI. KNA/Reuters
Pope Benedict XVI leaves at the end of his weekly general audience in St. Peter's Square at the Vatican, May 19, 2010. Alessandro Bianchi//Reuters
Benedict XVI moved back to the Vatican on Thursday to live out retirement as neighbors with ruling Pope Francis for the first time. 'He is happy to be back at the Vatican ... where he intends to dedicate himself to the service of the Church, above all with prayer,' a Vatican statement said.
Benedict XVI moved back to the Vatican on Thursday, opening an uncertain era in Catholic Church history where an "emeritus pope" and a ruling pontiff will live as neighbors for the first time.
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