Belobog

Belobog (also known as Bilobog, Belbog, Bialbog, Byelobog, Bielobog, Belun or Bylun) is the reconstructed Slavic god of light and the sun, he is the polar opposite of Chernobog, the black god.

Myths & Legends
As little is known about Slavic mythology, he has no historical records, and only exists in attempted reconstructions of the religion at the hand of folklorists. It's possible that he is an example of Fakelore.