Twins in mythology upon. However, other cultures attribute the outcome of twins to superior virility of the father. In various mythologies, twins often represent the dualistic nature of the universe. In Greek mythology, twins Apollo and Artemis, are the sun god and moon goddess, respectively. Similar forms of higher beings are reflected throughout different mythologies, as twin brothers Kuat and Iae represent the sun and moon in the Xingu mythology of Brazil. Egyptian God, Geb, and his twin sister, Nut, represented the binary nature of the world, with Geb being the God of the Earth, and Nut being the Goddess of the sky.
Artemis worshipped as a fertility/childbirth goddess in some places, assimilating Ilithyia, since, according to some myths, she assisted her mother in the delivery of her twin. During the Classical period in Athens, she was identified with Hecate. Artemis also assimilated Caryatis (Carya). As Aeginaea, she was worshipped in Sparta; the name means either huntress of chamois, or the wielder of the javelin (). Also in Sparta, Artemis "Lygodesma" was worshipped. This epithet means "willow-bound" from the Gr. "lygos" (λυγός, willow) and "desmos" (δεσμός, bond). The willow tree appears in several ancient Greek myths and rituals. She was worshipped at Naupactus as