This dragon-slaying hero appears in medieval romances about knights-errant, such as the Russian Dobrynya Nikitich. In some variants of Tristan and Iseult, Tristan wins Iseult for his uncle, King Mark of Cornwall, by killing a dragon that was devastating her father's kingdom; he has to prove his claim when the king's steward claims to be the dragon-slayer. Ludovico Ariosto took the concept up into "Orlando Furioso" using it not once but twice: the rescue of Angelica by Ruggiero, and Orlando rescuing Olimpia. The monster that menaced Olimpia reconnected to the Greek myths; although Ariosto described it as a legend to the characters, the story was that the monster sprung from an offense against Proteus. In neither case did he marry the rescued woman to the rescuer. Edmund Spenser depicts St. George in "The Faerie Queene", but while Una is a princess who seeks aid against a dragon, and her depiction in the opening with a lamb fits the iconography of St. George pageants, the dragon imperils her parents' kingdom, and not her alone. Many tales of dragons, ending with the dragon-slayer marrying a princess, do not precisely fit this cliché because the princess is in no more danger than the rest of the threatened kingdom.