Who
Baldassarre Cossa, the Pisan claimant who called the Council of Constance and was deposed by it.
Sources
- Annuario Pontificio
Lineage
In the succession →Claimant against Pope Gregory XII, 1410–1415.
John XXIII (antipope)
Giovanni Paolo Panini, Interior of St. Peter's, Rome, c. 1754 · Public domainGiovanni Paolo Panini, Interior of St. Peter's, Rome, c. 1754
Antipope1410–1415