Antipope John XXIII
Italian bishop; Pisan antipope (1410–1415)
Summary
Updated 2026-05-29
Baldassarre Cossa ruled as antipope John XXIII during the Western Schism, when three guys claimed to be pope and nobody could agree which one actually was. His five-year reign ended when the Council of Constance decided he wasn't it.
Biography
About
Baldassarre Cossa was Pisan antipope as John XXIII (1410–1415) during the Western Schism. The Catholic Church today regards him as an antipope in opposition to Pope Gregory XII, whom it recognizes as the rightful successor of Saint Peter. John XXIII was also an opponent of Benedict XIII, who was recognized by the French clergy and monarchy as the legitimate pope.
Profile
Tags & topics
Profile
Platforms
No platforms connected yet.
Profile
Timeline
No timeline events yet. Claim the profile to add milestones.
Profile
Trend
Fame score, last 90 days
Profile
Score breakdown
The six component signals behind the Fame score, and their ranks across the leaderboards.
Fame
Stable13.4
Composite of search demand, mentions, audience & graph footprint.
Score components
Historical20.1
Source confidence60.0
Completeness60.0
Global rank
—
Country rank
—
Category rank
#203
Profile
Sources
- WikidataHigh confidencewikidata · wikidata.org
- WikipediaHigh confidencewikipedia · en.wikipedia.org
- Pantheon 2.0High confidencedatabase · pantheon.world
.jpg)
.jpg)
.jpg)
