Henry III, Duke of Mecklenburg Duke of Mecklenburg (1337–1383) Parents Euphemia of Sweden Duke Albrecht II, Duke of Mecklenburg Children Euphemia of Mecklenburg-Schwerin Albert IV of Mecklenburg Maria of Mecklenburg-Schwerin Siblings Ingeborg of Mecklenburg-Schwerin Magnus I, Duke of Mecklenburg Albert, King of Sweden Anne of Mecklenburg Partners Matilda of Werle-Waren Ingeborg of Denmark, Duchess of Mecklenburg