On 11 February 2013, Benedict unexpectedly announced his resignation in a speech in Latin before the cardinals, citing a "lack of strength of mind and body" due to his advanced age. His resignation became effective on 28 February 2013. He is the first pope to resign since Gregory XII in 1415, and the first to do so on his own initiative since Celestine V in 1294. As pope emeritus, Benedict retains the style of His Holiness and continues to dress in the papal colour of white. He was succeeded by Francis on 13 March 2013, and he moved into the newly renovated Mater Ecclesiae Monastery for his retirement on 2 May 2013. In his retirement, Benedict XVI has made occasional public appearances alongside Francis.