Dorothea Augusta of Schleswig-Holstein-Gottorp
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| Dorothea Augusta of Schleswig-Holstein-Gottorp | |
|---|---|
| Duchess of Schleswig-Holstein-Sonderburg-Plön | |
| Tenure | 1633–1671 |
| Born | 12 May 1602 |
| Died | 13 March 1682 (aged 79) |
| Spouse | Joachim Ernest, Duke of Schleswig-Holstein-Sonderburg-Plön |
| Issue | John Adolphus, Duke of Schleswig-Holstein-Sonderburg-Plön Augustus, Duke of Schleswig-Holstein-Sonderburg-Plön-Norburg Duchess Ernestine Joachim Ernest II, Duke of Schleswig-Holstein-Sonderburg-Plön-Rethwisch Duke Bernhard of Schleswig-Holstein-Sonderburg-Plön Agnes Hedwig, Duchess of Schleswig-Holstein-Sonderburg-Glücksburg Duke Charles Henry Sophia Eleonora, Countess of Hohenlohe-Neuenstein |
| House | House of Holstein-Gottorp |
| Father | John Adolf, Duke of Holstein-Gottorp |
| Mother | Augusta of Denmark |
Dorothea Augusta of Schleswig-Holstein-Gottorp (12 May 1602 – 13 March 1682) was a German noblewoman from the House of (Schleswig-)Holstein-Gottorp, a cadet branch of the House of Oldenburg. She became the first Duchess of Schleswig-Holstein-Sonderburg-Plön[1] as the wife of Duke Joachim Ernest (1595–1671).

Dorothea Augusta was born on 12 May 1602 as the fourth child and second daughter of John Adolf, Duke of Holstein-Gottorp and his wife, Princess Augusta of Denmark. She had seven siblings, including three sisters, six of whom survived infancy.
In 1633, she married Joachim Ernest, Duke of Schleswig-Holstein-Sonderburg-Plön. On the occasion of their marriage, Joachim Ernest built a new residence and seat of government, Plön Castle, in the seat of his duchy, the town of Plön, which was completed in 1636. The couple ruled over only a small territory, as Joachim Ernest and his four brothers had divided the duchy of their father among themselves, resulting in five small ones. Their estate included Plön, Ahrensbök and Reinfeld.