Said castle is the Lembecksburg, in fact a medieval ring wall with a diameter of 95 meters and a height of ten meters. According to old lore, it was constructed in the 9th century as a stronghold against the Vikings and is named after the knight Klaus Lembeck who had allegedly been residing there as a steward of king Valdemar IV of Denmark in the 14th century. After breaking _his_ feudal oath, though, Lembeck is said to have been besieged by the king's host. <sep>, Pronoun: his <sep>, A: Valdemar IV of Denmark <sep>, B: Lembeck