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In page Council of Ephesus:

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Nestorius' dispute with Cyril had led the latter to seek validation from Pope Celestine I, who offered his support for Cyril to request that Nestorius recant his position or face excommunication. Nestorius pleaded with the Eastern Roman Emperor Theodosius II to call a council in which all grievances could be aired, hoping that he would be vindicated and Cyril condemned.[citation needed]