Frederica of Baden
Friederike Frederica Dorothea Wilhelmina of Baden , was Queen consort of Sweden from 1797 to 1809 by marriage to king Gustav IV Adolf of Sweden.
Frederica of Baden was born in Karlsruhe in the Duchy of Baden onMarch 1781, as the daughter of Karl Ludwig of Baden and Amalie of HesseDarmstadt. She was the younger sister of Empress Elisabeth Alexeievna , spouse of Tsar Alexander I of Russia.
Source: Wikipedia