Kostroma is the goddess of spring, fertility and summer in Eastern Slavic Mythology. She was the patroness of lovers. Kostroma is a daughter of Simargl and Kupalnitsa. Her brother and husband is Kupalo. According to the myth, Kupalo and Kostroma were twins. Their parents were Simargl, the god of fire, and Kupalnitsa, goddess of night. Once, Kostroma and Kupalo ran into a field to listen to songs of birds Sirin, the bird of sorrow, and Alkonost, the bird of joy. Both birds, especially Sirin…