Here is text from YouTube documentary:
“In the Slavic language, Velia remains a celebration incorporating the boundary between the world of the living and the world of the dead. And Veles serves as a guide for souls into the underworlds. The battle between Perun, that is, Ilya Muromets, and Veles – Seleucus – appears in various forms. But in later stories, instead of gods, they represent complementary figures separated by a furrow laid by Christ, who ultimately converts them. Veles is also likely represented by Saint Glasius, depicted in Russian iconography surrounded by sheep, cows, and goats. Another god associated with oaths and divination is Triglav, best known in the Pomerania region and the Baltic coast. In fact, he may simply be a local form of Veles. The three-headed statue of Triglav in Szczecin was described by Christian writers as having its mouth and eyes covered with a golden shell, interpreted as the god’s refusal to witness human sins. The three heads of the god symbolized the three realms governed by Triglav – the sky, the earth, and the underworld. His multifaceted nature serves as a profound reflection of the intricacies of the Slavic belief system.”