Jarilo was a son of the supreme Slavic god of thunder, Perun, his lost, missing, tenth son, born on the last night of February, the festival of Velja NoÄ‡ (Great Night), the pagan Slavic celebration of the New Year. On the same night, however, Jarilo was stolen from his father and taken to the world of dead, where he was adopted and raised by Veles. The Slavs believed the underworld to be an ever-green world of eternal spring and wet, grassy plains. With the advent of spring, Jarilo returned from the otherworld into the living world, bringing spring and fertility to the land. The first of gods to notice Jarilo's return to the living world was Morana, a goddess of death and nature, and also a daughter of Perun and Jarilo's twin-sister. The two of them would fall in love. The divine wedding between the brother and the sister, two children of the supreme god, was celebrated in a festival of summer solstice. But he was unfaithful to his wife, and so she kills him in retribution. This rather gruesome death is in fact a ritual sacrifice, and Morana uses parts of Jarilo's body to build herself a new house. Without her husband, however, Morana turns into a frustrated old hag, a terrible and dangerous goddess of death, frost and upcoming winter, and eventually dies by the end of the year.