The Council of Pisa is announced on July, 13,1408, by Cardinals from both Roman and Avignon lines, aiming to resolve the Western Schism by deposing both Pope Gregory XII and Antipope Benedict XIII. The Council officially opened in Pisa the following year on March 25, 1409.
Instead of resolving the schism, the Council of Pisa actually complicated the situation even more by electing Alexander V on June 26, 1409, and since neither Pope Gregory XII and Antipope Benedict XIII agree to resign, there were now three Pope claimants. It took the Council of Constance, years later to resolve it. (1414-1418).