In 1582 Pope Gregory XIII introduced a reformed calendar. The Protestant territories of the Holy Roman Empire refused it, because the reform came from the Pope. They adopted it only in 1700, after a decision of their own assembly, the Corpus Evangelicorum. To avoid the Pope’s name, they called it the Verbesserter Reichskalender, the improved imperial calendar. In the Empire, 18 February 1700 was followed directly by 1 March 1700. The calculation of the date of Easter remained different for more than 70 years.