Dorothea of Denmark, Duchess of Brunswick-Lüneburg
Princess Dorothea of Denmark( 29 June 1546 – 6 January 1617) was the Duchess of Brunswick- Lüneburg from 1561 until 1592 as the consort of Duke William the Younger.
She was regent for her son George from 1592 to 1596.
Dorothea von Medem
( Anna Charlotte) Dorothea von Medem( 3 February 1761 – 20 August 1821) was born a Gräfin( Countess) of the noble German Baltic Medem family and later became Duchess of Courland( a Baltic region).
Popularly known as Dorothea of Courland after her marriage to Peter von Biron, the last Duke of Courland, she hosted an aristocratic salon in Berlin and performed various diplomatic duties on behalf of her estranged husband.
Princess Sophia Dorothea of Prussia
Princess Sophia Dorothea of Prussia  (25 January 1719 – 13 November 1765) was the ninth child and fifth daughter of Frederick William I of Prussia and Sophia Dorothea of Hanover.
By marriage, she was a Margravine of Brandenburg-Schwedt.
Dorothea of Schleswig-Holstein-Sonderburg-Glücksburg
Princess Dorothea of Schleswig-Holstein- Sonderburg- Glücksburg( 28 September 1636 – 6 August 1689), was Duchess consort of Brunswick- Lüneburg by marriage to Christian Louis, Duke of Brunswick- Lüneburg, and Electress of Brandenburg by marriage to Frederick William, Elector of Brandenburg, the" Great Elector".
Dorothea, Abbess of Quedlinburg
Princess Dorothea of Saxony (7 January 1591 - 17 November 1617) reigned as Princess-Abbess of Quedlinburg from 1610 until her death.
Dorothea was born in Dresden to Christian I, Elector of Saxony, and his wife, Princess Sophie of Brandenburg.
Her baptism was notably held without the customary exorcism.
Princess Dorothea of Courland
Dorothea von Biron, Princess of Courland, Duchess of Dino, Talleyrand, and Sagan, known as Dorothée de Courlande or Dorothée de Dino (21 August 1793 – 19 September 1862), was a Baltic German noblewoman.
Her mother was Dorothea von Medem, Duchess of Courland, and although her mother's husband, Duke Peter von Biron, acknowledged her as his own, her true father may have been the Polish statesman Aleksander Batowski.
For a long time, she accompanied the French statesman Charles Maurice de Talleyrand-Périgord; she was the separated wife of his nephew, Edmond de Talleyrand-Périgord.
Edmond de Talleyrand-Périgord
Edmond de Talleyrand-Périgord, 2nd Duke of Talleyrand, 2nd Duke of Dino (1 August 1787, Paris –
14 May 1872, Florence), was a French general of the Napoleonic Wars.
Gotthard Kettler
Gotthard Kettler, Duke of Courland (also "Ketteler", ; 2 February 1517 – 17 May 1587) was the last Master of the Livonian Order and the first Duke of Courland and Semigallia.
Hedvig Elizabeth von Biron
Hedvig Elizabeth von Biron of Courland( 1727–1797), was a princess of Courland and a Russian courtier, daughter of the Duke of Courland, Ernst Johann von Biron, and Benigna Gottlieb von Trotha gt Treyden, and the sister of Peter von Biron.
She was the Ober- Hofmeisterin of the Empress Elizabeth of Russia and an influential person at the Russian court.
Margravine Louise Charlotte of Brandenburg
Louise Charlotte of Brandenburg( 13 September 1617 – 28 August 1676), was a Duchess consort of Courland by marriage to Duke Jacob Kettler of Courland.
She was the de facto ruler of Courland during the reign of her spouse.
She was born to George William, Elector of Brandenburg and Elizabeth Charlotte of the Palatinate( 1597 – 1660).

Question: Where did Princess Dorothea Of Courland's husband die?
Answer: Florence