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In page Philip Melanchthon:

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Melanchthon played an important role in discussions concerning the Lord's Supper which began in 1531.[1] He approved of Bucer's Wittenberg Concord and discussed the question with Bucer in Kassel in 1534.[citation needed] He worked for an agreement on this question, as his patristic studies and the Dialogue (1530) of Johannes Oecolampadius had made him doubt the correctness of Luther's doctrine.[citation needed]