Council of Pisa

It tried to end the Western Schism by deposing Gregory XII (Rome) and Benedict XIII (Avignon) and electing Alexander V. Since neither accepted, the result was three claimants to the papacy until the Council of Constance.

Convoked by

Cardinals of both the Roman and Avignon obediences

No church recognizes it as ecumenical today; the Catholic Church does not count it among its general councils.