Largely written by Philip Melanchthon, the Augsburg Confession is divided into two parts. Articles 1-21 present doctrines confessed and taught among the Lutherans. Articles 22-28 review Lutheran corrections of abuse in the life and worship of the church. On 25 June 1530 the Augsburg Confession was presented to a meeting of the imperial diet, a gathering consisting of the electors, princes, nobles, and representatives of the cities of the Holy Roman Empire. This meeting of the imperial diet had been summoned by Emperor Charles V to compose religious differences in the empire. The Diet did not succeed in settling Protestant and Roman Catholic differences, nor were all the Protestants present willing to support the Augsburg Confession. Following the presentation of the Augsburg Confession, four south German cities presented their own Reformed statement of faith in the Confessio Tetrapolitana.