How much time you got?

I don't have much right now.

Suffice it to say that, to my knowledge, "Yule" is far more ancient than "Christmas," and refers to celebration of the winter solstice. The yule log, decoration of indoor spaces with winter greenery (i.e., evergreen boughs and wreaths, etc.), and other seasonal customs (e.g., feasting, copious drinking, the business with mistletoe, etc.) all date back to the pre-Christian celebrations that the Church co-opted when arbitarily assigning a midwinter date as the supposed birthday of Christ.