Halloween is originally a celebration marked in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day, in which people remember the dead, including saints, martyrs, and all the faithful departed.
However, Pope Boniface IV dedicated the Pantheon in Rome in honor of all Christian martyrs, and the Catholic feast of All Martyrs Day was established in the Western church. Pope Gregory III later expanded the festival to include all saints as well as all martyrs, and moved the observance from May 13 to November 1.
After that, Halloween festivities became unique for telling ghost stories and mischief-making of all kinds as by the middle of the 19th century, annual autumn festivities were common.
