The king asleep in mountain (D 1960.2 in Stith Thompson's motif index system) is a prominent folklore trope found in many folktales and legends. Thompson termed it as the Kyffhäuser type. Some other designations are: king in the mountain, king under the mountain, or sleeping hero. Examples include the legends of King Arthur, Fionn mac Cumhaill, Charlemagne, Ogier the Dane, King David, Frederick Barbarossa at Kyffhäuser, Constantine XI Palaiologos, Kraljević Marko, Sebastian of Portugal and King Matjaž.