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...r designed by a commission assembled by Pope Gregory XIII in the sixteenth century."}}{{efn|Many countries that use other calendars for religious purposes use ...ays; when Russia and Greece did so (for their civil calendars) in the 20th century, the jump was 13 days. For other countries and territories, see [[List of a ...

==Recorded history before 12th century== ...Oxford|access-date=14 October 2014|url=http://www.visitoruk.com/Oxford/8th-century-T4311.html}}</ref> ...