The word "bogatyr" is not originally Russian. There have been different theories about the origin of the word but researchers agree that "bogatyr" is not of Slavic origin. Many researchers suspect the word "bogatyr" is derived from a Turco-Mongolian word: "baatar", "bagadur", "baghtur", "bator", "batyr", and "batur", all with meanings along the lines of hero, warrior, and brave. Turkic and Rus-Kievan peoples had a long history of contact and conflict, providing opportunities for exchange of loan-words. The word "bogatyr" is used similarly in other modern languages such as Polish ("bohater"), Hungarian ("bátor") and Persian ("bahadur"), meaning hero, brave, or athlete.