Samhain was the most widely celebrated of the ancient Celtic festivals. It was a celebration of the harvest & the start of a new year. Agriculturally, it was the time when the last fruits of the harvest were collected & stored & the livestock were culled & quartered for the winter ahead. It was considered unwise to eat any fruit or grain not harvested by this day & any animal that would not survive the winter was slaughtered. For this reason, Samhain was also known as the blood harvest.