 According to the 12th-century Russian Primary Chronicle, prisoners of war were sacrificed to the supreme Slavic deity Perun.Sacrifices to pagan gods, along with paganism itself, were banned after the Baptism of Rus' by Prince Vladimir I in the 980s.Archeological findings indicate that the practice may have been widespread, at least among slaves, judging from mass graves containing the cremated fragments of a number of different people.