Original: 1409 & ndash ; Western Schism : the Roman Catholic church is led into a double schism as Petros Philargos is crowned Pope Alexander V after the Council of Pisa , joining Pope Gregory XII in Rome and Pope Benedict XII in Avignon .
Simplified: 1409 - Western Schism : The Catholic church is led into a double schism as Petros Philargos is crowned Pope Alexander V after the Council of Pisa , joining Pope Gregory XII in Rome and Pope Benedict XII in Avignon .