 As a young boy and in later life , Pacelli was an ardent follower of the Virgin Mary . He was consecrated as a bishop on 13 May 1917 , the very first day of the apparitions of Our Lady of Fátima . He consecrated the world to the Immaculate Heart of Mary in 1942 , however , in the second " secret " of Our Lady of Fátima and the letters received from several bishops from Portugal based on the revelations of Lucia Santos in 1929 , Our Lady expressly , and specifically asked for the consecration of Russia , not " the world " . His remains were to be buried in the crypt of Saint Peter 's Basilica on the feast day of Our Lady of Fátima , 13 October 1958 . 
