Original: September 20 & ndash ; Unhappy with Pope Urban 's critical attitude towards them , the majority of the cardinals meet at Fondi and elect Clement VII as antipope and establish a rival papal court at Avignon .
Simplified: September 20 - Unhappy with Pope Urbans critical attitude towards them , the majority of the cardinals meet at Fondi and elect Clement VII as antipope and establish a rival papal court at Avignon .