Since his shocking resignation in February 2013, the German pope emeritus, whose birth name was Joseph Ratzinger, had been leading a tranquil life at a disused convent on the premises of the Vatican.
His condition had been deteriorating for some time, but the Vatican announced on Wednesday that it had become worse, and his successor, Pope Francis, urged Catholics all around the world to pray for him.
"With sorrow, I inform you that the Pope Emeritus, Benedict XVI, passed away today at 9:34 in the Mater Ecclesiae Monastery in the Vatican," Vatican spokesman Matteo Bruni said in a statement.