 Hence, Porin and Porga were two different variants of the deity Perun, and not one or two names of separate historical rulers.The thesis was subsequently supported by Denis J. Alimov, who noted that the name of 13th-century Mordvin chief Purgas derives from the deity of thunder Purgin, as well in the 10th-century Kievan Rus Perun became the supreme deity associated with the ruler.According to Constantine VII (r. 913 to 959) in "De Administrando Imperio" Porga was baptized during the reign of Emperor Heraclius (r. 610–641) Chapter 31, 1.4, says, "These same Croats had the father of "Ποργα" (Porga) for their archon at that time", and, 1.5, "The Emperor Heraclius ordered and brought priests from Rome, and made of them an archbishop and a bishop and presbyters and deacons, and baptized the Croats; at that time these Croats had Porga for their archon."