Salem Witch Trials - What made a Puritan village turn against itself?
Seth Gabel - Cotton Mather - Salem
Pope Gregory XIII, when reorganizing the old Julian calendar, established January as New Year's Day in Protestants who wouldn't dare follow such Popeish nonsense continued marking April as New Year's Day...hence, April Fool's Day.
Cotton Mather and Joseph Dudley: Allies and Enemies in 1695 - http://www.newenglandhistoricalsociety.com/cotton-mather-joseph-dudley-allies-enemies-1695/
Genealogy profile for Rev. Cotton Mather, Salem Witch Trials
Cotton Mather's Memorable Providences, Relating to Witchcrafts and Possessions (1689)