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Eufemia Ericsdotter, Duchess Consort of Mecklenburg, was born as a heiress of Sweden and of Norway, in 1317, and died sometime in 1370.

Her father was Eric of Sweden (b c 1282, murdered 1318), Duke of Sudermannia, second son of King Magnus I of Sweden, and her mother was Princess Ingeborg of Norway (1301-c 1360), the heiress and the only legitimate daughter of King Haakon V of Norway, whose hereditary Kingdom of Norway thus became the inheritance of Eufemia and her brothers.

In 1319, her infant elder brother Magnus VII of Norway (1316-1374) succeeded their maternal grandfather in the throne of Norway, and in 1320, Swedish nobles exiled their uncle king Birger of Sweden, after which the infant Magnus was elected King of Sweden.

Euphemia was married (in Rostock 10 April 1336) to her distant kinsman Duke Albert II, Duke of Mecklenburg (1318-18.2.1379), a North-German lord deeply interested in obtaining some power in Scandinavia, e.g fiefs or income. Later, Albert was to gain the nickname "Fox of Mecklenburg", to reflect his intrigues as well as avarice.

Eufemia lived long enough to see that her brother's branch of the family went into severe difficulties, albeit its extinction (which happened in 1387) was not necessarily foreseeable then. Eufemia saw her own second son depose her brother from the Swedish throne, and ascend as King Albert of Sweden. Already in Eufemia's lifetime it was easy to see that her genealogical position became a pivotal point to many future claims to the Scandinavian thrones.

Although her husband married a second time when widowed, all his legitimate children were born of Eufemia.

Her Dynasty was already taking shape. At the time of her death, she had five surviving children:

• Duke Henry III of Mecklenburg (c 1337, d after accident at tournament in Wismar 24.4.1383). Married firstly Ingeborg of Denmark (b 1.4.1347, d c 1370), eldest daughter of sonless King Waldemar IV of Denmark. Claiments to Denmark. They had children: Albert (Claiment to position of hereditary Prince of Denmark), Eufemia, Mary and Inbeborg. Duke Henry III married secondly Mechtild of Werle.

• Duke Albert III of Mecklenburg aka Albert of Sweden (1340-1412), King of Sweden 1364-89. Married firstly 1359 Richardis of Schwerin (d 1377 as queen of Sweden); they had children: Eric (hereditary prince of Sweden) and Richardis. Duke Albert III married secondly Agnes of Brunswick (d 22.12.1434).

• Duke Magnus I of Mecklenburg (d 1.9.1385), married 1369 Elisabeth of Pomerania-Rügen. Children: at least son John, possibly the daughter Eufemia was already born. His plentiful issue continues through centuries to this day.

• Ingeborg of Mecklenburg, d c 1395,. She married firstly (Berlin February 1360) Louis VI the Roman, Duke of Bavaria (b Munchen 12.5.1330 d Berlin 17.5.1365), childless, she was dowager of Ludwig of Bavaria; and married secondly Count Henry II of Holstein (b c 1317, d 16.11.1384), of which marriage several children Gerhard, Albert, Henry, and Sophia.

• Anna (d 1415), married 1362/6 Count Adolf of Holstein (d 1390), but died childless. Her line extinct by her own death in 1415.