The Feast of Juul was a pre-Christian festival observed in Scandinavia at the time of the Winter Solstice. Fires were lit to symbolize the heat, light, and life-giving properties of the returning sun. A Yule (or Juul) log was brought in with great ceremony and burned on the hearth in honor of the Scandinavian god Thor. A piece of the log was kept as both a token of good luck and as kindling for the following year’s log. The present-day custom of lighting a Yule log at Christmas is believed to have originated in the bonfires associated with the Feast of Juul. Discuss
Source: The Free Dictionary