The Holly King, the Druidic Lord of the Winterwood and darksome twin of the waning year, rules from Midsummer to Midwinter. At Midsummer, he goes to battle with his twin, the Oak King, for the favor of the Goddess. He slays the Oak King, who goes to rest in Caer Arianrhod until they do battle again at Midsummer.
Yule. In ancient Scandinavia, this festival lasted 12 days (and nights). The first night of Yule (the night before the Solstice) was called the "mother's night". That night the Nordic Pagans used to sit and wait for the birth of the Sun God, Balder, born of the goddess Frigg and fathered by Odin. With the winter solstice, the goddess turned wheel of the year to give you a new point of departure.