Byelobog was a Tzimisce methuselah of the fourth generation that dwelled in the lands between the Baltic Sea, close to the Pinsk Marshes of Lithuania. He was revered and feared as the "White God" by the inhabitants.
According to the legends of his clan, Byelobog was Embraced by the Antediluvian because he was the wildest mortal the creature had ever met, and it was curious as what the Embrace would do to the "White God". It is known fact that he became a mighty koldun with power over the waters within his domain – having mastery over the swamp-things, the fogs and, above all, the howling snows that grip the land in winter.
His trademark white skin could be shed in flakes and spread with the winds across his domain, "marking" everything within as his property and thus establishing a mystical connection with his victims. Some claim that he created a revenant line called Khazi, bred exclusively to fulfill his demands. Other rumors says he sails from place to place with a magic skiff, his body resembling a cadaver in the grip of plague.
Byelobog was one of the most powerful Tzimisce ever to walk the Earth, but he remained aloof from the politics of his clan. Like Yorak, he confirmed their Antediluvian sire's fear that its progeny would surrender to wholly esoteric pursuits, for both of them retreated into their respective realms and had little to do with one another.
When the Teutonic Knights invaded eastern Europe, it is said that one of the Khazi revenants betrayed his master and led the Witch-hunters to Byelobog in the Pripet Marshes. After this altercation, a weakened Byelobog was diablerized by Lugoj Blood-breaker at the early stages of the Anarch Revolt, dealing a grievous blow to Tzimisce power in the region.
It is unknown whether or not Lugoj had already been substituted by the Tzimisce Antediluvian by the time he diablerized Byelobog. Clanbook: Tzimisce Revised hints that the Eldest was disappointed with some of its most powerful childer and both Yorak and Byelobog were destroyed under suspicious circumstances. This may indicate they were disposed of by the founder of their lineage as part of some unfathomable scheme to bring change to the clan.