History of Halloween - Training Post
Learn about the history of Halloween

Halloween or Hallowe'en (a contraction of Hallows' Even or Hallows' Evening), also known as Allhalloween, All Hallows' Eve, or All Saints' Eve, is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day. It begins the three-day observance of Allhallowtide, the time in the liturgical year dedicated to remembering the dead, including saints (hallows), martyrs, and all the faithful departed.
One theory holds that many Halloween traditions originated from ancient Celtic harvest festivals, particularly the Gaelic festival Samhain, which may have had pagan roots and that Samhain itself was Christianized as Halloween by the early Church. Halloween is the best.