Zorya

In Slavic mythology, Zorya (alternately, Zora, Zaria, Zarya, Zory, Zore, "Dawn"; Zorza in Polish, Zara-Zaranica, Zvezda, Zwezda, Danica, "Star") are the two guardian goddesses, known as the Auroras. They guard and watch over the winged doomsday hound, Simargl, who is chained to the star Polaris in the constellation Ursa Minor, the "little bear". If the chain ever breaks, the hound will devour the constellation and the universe will end. The Zoryas represent the Morning Star and the Evening Star.
The Zoryas serve the sun god Dažbog, who in some myths is described as their father. Zorya Utrennyaya, the Morning Star, opens the gates to the god's palace every morning for the sun-chariot's departure. At dusk, Zorya Vechernyaya—the Evening Star—closes the palace gates once more after its return.
The home of the Zoryas was sometimes said to be on Bouyan (or Buyan), an oceanic island paradise where the Sun dwelt along with his attendants, the North, West and East winds.