Yule
Around 21 December
Yule names a midwinter feast attested in Germanic and Norse sources, and the word survives in English and the Scandinavian languages as the ordinary term for the season.
How much of Christmas practice descends from it is contested and frequently overstated. Evergreens, feasting and light at the solstice are widespread enough that direct borrowing is difficult to demonstrate for any single custom.
The Yule log is the best-documented survival, recorded across northern Europe as a single large log kept burning through the festival, with its ashes and charred remnant kept for luck through the year.