Albert II, Duke of Mecklenburg (c. 1318 – 18 February 1379) was a feudal lord in Northern Germany on the shores of the Baltic Sea.

Through this marriage, Albert gained standing in Sweden by means of his wife's hereditary estates and ancestral connections.

Prince Henry married her some time around 1362, and their infant son was soon offered unsuccessfully as heir to the kingdom of Denmark in competition with Valdemar's youngest daughter, Queen Margaret of Norway, the future ruler of the Kalmar Union.

Influential nobles attempted to curb the concentration of royal power in Sweden and set up Magnus' own elder son Eric as a rival king.

Already in Albert and Euphemia's lifetime it was recognized that her genealogical position would become a pivotal point for any future claims to the Scandinavian thrones.