Sventovit

From Slavic.info

Elbe Slavs

The most venerated god of the Elbe Slavs was Svantovit, whose worship centered about hjs idol in the great temple at Arkona, on the island of Riigen. Omens were drawn from a white horse sacred to him, and a festival was celebrated in his honor soon after harvest, when portents were sought for the coming year. The deities Rugievit (or Rinvit), worshiped at Garz, Porevit, Porenutius ("Son of Perun"), and the war-god Gerovit may have been doublets of Svantovit.