John I Lord of Mecklenburg (1211–1264) Parents Christina of Sweden Henry Borwin II, Lord of Mecklenburg Children John II, Lord of Mecklenburg Nicholas III Henry I, Lord of Mecklenburg Elisabeth of Mecklenburg Albert I, Lord of Mecklenburg Siblings Nicholas I of Werle Pribislaw I Henry Borwin III, Lord of Rostock Margarete|Margareta von Mecklenburg (von Rostock) Matilda of Mecklenburg Partners Luitgarde of Henneberg