Overview
Anna Eleonore of Stolberg-Wernigerode (26 March 1651 - 27 January 1690), was a German regent; Princess of Anhalt-Köthen by marriage to Emmanuel, Prince of Anhalt-Köthen, and regent of Anhalt-Köthen during the minority of her son from 1671 until 1690.
Life
Born in Ilsenburg, she was the second child of Henry Ernest, Count of Stolberg-Wernigerode and Anna Elisabeth of Stolberg.
In Ilsenburg on 23 March 1670, Anna Eleonore married Emmanuel, Prince of Anhalt-Köthen. The marriage lasted only eight months, until Emmanuel's death on 8 November.
Regency
Three months pregnant at the time of her husband's death, Anna Eleonore was named regent of the Principality of Anhalt-Köthen until the birth of her child: if it was a boy, he immediately became the new Prince and she kept the regency, but if she gave birth to a girl, the other Anhalt principalities would divided Köthen between them.
From Wikipedia (CC BY-SA 4.0).