^ OK, I did find something rather interesting. While I'm still uncertain if the (Balto-)Slavic yule pire had predeceding traditions, I found something that some Proto-Slavs and Proto-Balto-Slavs did believe that the fire burning the wood was seen as a newly born god killing the old yule, who wanted to bring chaos into the Universe, a belief that stemmed from the Proto-Indo-European myth of a great serpent trying to usher chaos each year, only to be thwarted and defeated by a great serpentkiller. This Proto-Indo-European myth may be a common ancestor of this and similar myths down the line, like the Norse myth of Ragnarok. Many other Slavs believed the yules to be the embodiment of the gods, especially those closely associated with forests, and didn't treat the yules as dead trees, but as living people, giving them wheat, wine and honey, before burning them in the pire, which these Slavs saw as the gods within the yules dying, only to be instantly resurrected by the ash fuming upwards from the fire into the air. In addition, there were similar traditions amongst other Indo-European peoples, some of which still survive into today, in places like England, France, Germany, Italy, Albania and Greece. The old Iranian religion of Zoroastrianism (the real life basis for the Faith of R'hlor in Game of Thrones) had a huge emphasis on fire. Even though it's not clear whether Proto-Indo-Europeans had yule pires, it goes without saying (and y'all will probably jokingly and insultfully call me Captain Obvious for it) that the Proto-Indo-European religion was the precursor to many religions accross the Old World. The Hittite Teshub, Greek Zeus, Roman Jupiter, Germanic Thunor, Norse Thor, Slavic Perun, Zoroastrian Ahura Mazda and Proto-Indo-Aryan Dyaus-Pitar are probably different offshoots of an original "sky-father" in the Proto-Indo-European religion.