Elbe Slavs
From Slavic.info
Religion of the 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.
Another important deity was Triglav ("ThreeHeads"), whose chief seats of worship were in Stettin and Wollin, and whose cult seems to have resembled that of Svantovit. The divinity Radigast, who likewise possessed an elaborate temple and a sacred horse, is taken by some scholars to be the eponymous deity of the capital of the Rhetarians; and the same theory may be advanced concerning Jula, whose lance was an object of worship at Julin (the modern Wollin in Pomerania).
Other Elbe gods, of whom we know little more than the names, were Podaga (cf. the Polish airgoddess Pogoda?), Pripegala, Rinvit, Turupid, Puruvit, Pisamar, and Proven. Zcernoboch ("Black God," perhaps the Tierna Slav of the Icelandic Knytlingasaga} seems to have been a god of evil.
Besides gods the Elbe Slavs worshiped goddesses, but we have no details concerning them, except that one of them was represented on a banner. The veneration of household deities is also recorded.