Koliada
Koliada or koleda (Cyrillic: каляда, коляда, коледа, колада, коледе) is the traditional Slavic name for the period from Christmas to Epiphany or, more generally, for Slavic Christmas-related rituals, some dating to pre-Christian times. It represents a festival or holiday, celebrated at the end of December to honor the sun during the Northern Hemisphere winter solstice.