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as number 154. Several changes were made to the list during the 20th century. Christopher was considered a legitimate pope for a long time but was removed due to how he obtained the papacy. Pope-elect Stephen was listed as Stephen II until the 1961 edition, when his name was removed. The decisions of the Council of Pisa (1409) were reversed in 1963 in a reinterpretation of the Western Schism,

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