In Photos: Pope Benedict XVI (44 images)

Pope Benedict XVI presents a book as a gift to Greek Orthodox Patriarchate Theophilos during his visit to the Greek Orthodox Patriarchate in the Old City of Jerusalem on May 15, 2009. (UPI Photo/Heidi Levine/Pool)

Pope Benedict XVI gestures as he attends the Palm Sunday celebration at Saint Peter's square at the Vatican, on April 1, 2012. The Palm Sunday marks the holy week of Easter in celebration of the crucifixion and resurrection of Jesus Christ. UPI/Stefano Spaziani

Pope Benedict XVI celebrates the midnight Christmas mass at St. Peter's Basilica in Vatican City on December 24, 2012. UPI/Stefano Spazani

Pope Benedict XVI prays at the Nativity scene after celebrating Christmas Eve Mass in St. Peter's Basilica at the Vatican on December 24, 2012. UPI/Stefano Spazani