Ancient Celts marked Samhain as the most significant of the four quarterly festivals. .
Samhain pronounced (sow-in) is mentioned in some of the earliest Irish literature and is known to have pre-Christian roots.
The Gaelic festival marks the end of the harvest season and the beginning of winter or the "darker half" of the year. Traditionally celebrated at the end of October it is the Midpoint between Autumn Equinox and Winter Solstice.