Council of Siena

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In the Catholic Church, the Council of Siena (1423–1424) marked a somewhat inconclusive stage in the Conciliar movement that was attempting reforms in the Church. If it had continued, it would have qualified as an ecumenical council. In the official List of ecumenical councils, the Council of Siena is no longer listed, as the conciliarism expressed there was later branded as a heresy.