The method of electing the pope has varied through the history of the church. Since 1179, Roman Catholic cardinals have selected the next pope.

Adapted from Globe Staff Graphic / James Bennett, Alejandro Gonzalez, and Kathleen Hennrikus

PHOTOS: Conferencia, Katholiek; Nieuwsblad Argentina; Arquidiocese San Paulo
SOURCES: Rev. Thomas Reese, The Catholic Encyclopedia, Encyclopedia Britannica, truecatholic.org; Knight-Ridder Tribune