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This adjective is normally applied to two things – Gregorian chant and the Gregorian calendar. Pope Gregory I (c.540–604AD), known as Saint Gregory the Great, is said to have encouraged the former around the year 600AD as a variety of plainsong or plainchant, the oldest form of vocal music in the Christian Church. Gregory XIII (1502–85) commissioned the revision of the old Julian calendar (see below) and gave his name to the calendar which is now the accepted version worldwide. In order to accommodate the new calendar, 11 days were ‘missed’. The Reformation saw a number of countries refuse to accept the papal decree about the new calendar, so that a dual date system was introduced in a lot of places.