Rodion Oslyabya (Russian: Родион Ослябя) was a Russian monk from Saint Sergius's Trinity Abbey who became famous for his part in the Battle of Kulikovo.Most details of his life are legendary. According to a 15th-century source, he was a nobleman (boyar) rather than a monk. He fought in the Battle on Pyana River, in a rank of tysyachnik (leader of a thousand knights), and survived the defeat. According to hagiography, he accepted vows just prior to Battle of Kulikovo. His relative (some say brother) was Alexander Peresvet, although it is likely that this relationship is merely the product of later hagiographic tradition.