Upir

The Upir is the ancient Slavic predecessor to the modern vampire, with the earliest mentions of the name appearing in chronicles and birch bark scripts of the early Medieval period. Unlike the refined characters of later fiction, the original Upir was a terrifying, bloated corpse, believed to be an "unclean" deceased person—such as a sorcerer or someone who died a violent death. In the villages of Kievan Rus, they were feared as physical monsters that rose from their graves at night to prey on livestock and people.

Various forms of the Upir myth eventually spread across all Slavic territories, from the Balkans to the northern forests, evolving into different regional versions of the vampire. However, like most core Slavic mythological concepts, the image of the Upir originated within the territory of Kievan Rus around 900 CE. These legends highlight a deep-seated belief that the boundary between life and death was porous, requiring complex rituals to prevent the restless dead from returning as a physical threat to the living.