According to the Gesta Hungarorum by Bele Regis Notarius, Laborec was a Slavic ruler in the 9th century who was a vassal of Great Moravia. According to the Gesta Hungarorum, at the time of the Hungarian conquest of the Carpathian Basin around 896 Laborec opposed the conquest of Carpathian Ruthenia by Hungarian tribes led by Árpád. His existence is controversial as the only source that mentions him, Gesta Hungarorum, was written in the 13th century, more than 300 years after his presumed rule.