Kolyada
Russian traditions
Russians' pagan ancestors celebrated Kolyada, a winter solstice holiday. Early Slavs celebrated it from December 25 to January 6, as if they knew already back then that centuries later these will become almost the exact dates marking the New Year festive season in modern Russia.
Kolyada lasted 12 days, the ritual was presided over by 12 priests, and they predicted the future harvest using 12 sheaves of wheat and water from 12 wells. As you have probably guessed, the figure 12 had a special role to play in that holiday.