The history of Slavic civilizations spans thousands of years, and Slavic gods are as old and worn out as the world itself. But historically, we have very little information about our ancestors’ religious beliefs, and pre-Christian Slavic religious traditions are sometimes reduced to commonplace demonology. Yet the facts allow us to claim that in Slavic culture there existed its own pantheon of gods, similar to the pantheons of Ancient Rome and Greece. Using comparative mythology, hermeneutics, psychology, as well as analysis of the sacred lexicon of Slavic languages—because language, which preserves the memory of thousands of years, is the most objective tool for reconstruction—the author investigates the cults of forgotten gods. Why, then, is the history of Slavic civilizations almost unknown to us today? At what historical stage was the memory of Slavic gods lost, as well as the memory of Slavic prehistory? And how does this relate to a turning point in the history of the Russian people—the era of adopting Christianity? “The Return” of the forgotten gods not only helps us decipher the spiritual world of forgotten Slavic civilizations, but also opens new horizons and new directions for movement.