Kupalnitsa

Kupalnitsa is the goddess of the night in Slavic mythology. She is a sister of Vechorka, Poludnitsa and Zorya, and also the wife of Simargl. Her children, Kupalo and Kostroma, died because of love for each other.

Kupalnitsa flies over the world in anticipation of her beloved god Simargl, who is allowed to leave his post only once a year. She is the patron goddess of various bodies of water: lakes and rivers, seas and springs, oceans and swamps. All water spirits and all rusalki are subordinate to Kupalnitsa.