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Theologian, b. at Wesel, 17 June, 1788; d. at Bonn, 11 May, 1877. He was appointed professor of theology at Bonn in 1826 and in 1832 he founded with his colleague, J.W.J. Braun (d. 1863), the "Zeitschrift für Philosophie und Katholische Theologie" (1832-52), the chief purpose of which was to defend the teachings of Hermes. He also published under the title "Christkatholische Dogmatik" (Münster, 1834-36) the theological writings which Hermes (d. 1831) had left in manuscripts. This publication was followed by sharp controversy, and eventually by the condemnation of the works of Hermes, which Pope Gregory XVI placed upon the Index, 26 September, 1835. In 1843, Achterfeldt incurred suspension from his professorial chair rather than sign the declaration of faith required by the Coadjutor Archbishop von Geissel of Cologne . Though Hermesianism lost ground and finally disappeared during the revolution of 1848, Achterfeldt clung to his views. In 1862, however, he was reinstated as professor, and in 1873, having made his submission to ecclesiastical authority, he was freed from suspension.

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The Catholic Encyclopedia is the most comprehensive resource on Catholic teaching, history, and information ever gathered in all of human history. This easy-to-search online version was originally printed between 1907 and 1912 in fifteen hard copy volumes.

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Designed to present its readers with the full body of Catholic teaching, the Encyclopedia contains not only precise statements of what the Church has defined, but also an impartial record of different views of acknowledged authority on all disputed questions, national, political or factional. In the determination of the truth the most recent and acknowledged scientific methods are employed, and the results of the latest research in theology, philosophy, history, apologetics, archaeology, and other sciences are given careful consideration.

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Copyright © Catholic Encyclopedia. Robert Appleton Company New York, NY. Volume 1: 1907; Volume 2: 1907; Volume 3: 1908; Volume 4: 1908; Volume 5: 1909; Volume 6: 1909; Volume 7: 1910; Volume 8: 1910; Volume 9: 1910; Volume 10: 1911; Volume 11: - 1911; Volume 12: - 1911; Volume 13: - 1912; Volume 14: 1912; Volume 15: 1912

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