Unfortunately, medieval chronology is extremely hard to pin down. The year was considered to begin at Easter and since this could fall any time between March 22 and April 22, a fixed date of March 25 was generally preferred. The change over to New Style took place in the 16th century but was not everywhere accepted until the 18th, which leaves the year to which events of January, February, and March belong in the 14th century a running enigma—further complicated by use of the regnal year (dating from the reigning King’s accession) in official English documents of the 14th century and use of
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