The Oxenstierna family held vast estates in Södermanland and Uppland during the late Middle Ages and Renaissance.
In the 15th century, the family at times held the position of Regent of Sweden during the turbulent civil wars of the Kalmar Union.
The family began to adopt its armorial designation of Oxenstierna[2] as a personal surname towards the end of the 16th century.
[4] [5] The family's most notable members include the following (in chronological order): Kings Christian IX of Denmark, Haakon VII of Norway, and Carl XVI Gustaf of Sweden were all descended from branches of the Oxenstierna family.
All three monarchs descended from the Oxenstierna family through their common ancestor, Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Glücksburg.