Straddling the line between fall and winter, plenty and paucity, life and death, Halloween is a time of celebration and superstition. It is thought to have originated with the ancient Celtic festival of Samhain, when people would light bonfires and and wear costumes to ward off roaming ghosts. In the eighth century, Pope Gregory lll designated November 1 as a time to honor all saints and martyrs; the holiday, All Saints Day, incorporated some traditions of Samhain. The evening before was known as All Hallow’s Eve and later Halloween. Over time, Halloween evolved into a secular, community-based event characterized by child friendly activities such as trick or treating. In a number of countries around the world, as the days grow shorter and the nights grow colder, people continue to usher in the winter season with gatherings, costumes, and sweet treats.