Christoph, Duke of Württemberg
Christoph of Württemberg, Duke of Württemberg (12 May 1515 – 28 December 1568) ruled as Duke of Württemberg from 1550 until his death in 1568.
Charles Frederick II, Duke of Württemberg-Oels
Charles Frederick II of Württemberg- Oels( 7 February 1690 in Merseburg – 14 December 1761 in Oleśnica) was a Duke of Oels- Württemberg and Regent of the Duchy of Württemberg.
Charles Alexander, Duke of Württemberg
Charles Alexander of Württemberg (24 May 1684 – 12 March 1737) was a Württemberg noble from 1698 who governed the Kingdom of Serbia as regent from 1720 until 1733, when he assumed the position of Duke of Württemberg, which he held until his death.
Duchess Frederica of Württemberg
Duchess Frederica of Württemberg( 27 July 1765 – 24 November 1785) was a daughter of Frederick II Eugene, Duke of Württemberg and Friederike Dorothea of Brandenburg- Schwedt.
Frederick II Eugene, Duke of Württemberg
Friedrich Eugen, Duke of Württemberg (21 January 1732 – 23 December 1797) was the fourth son of Karl Alexander, Duke of Württemberg, and Princess Maria Augusta of Thurn and Taxis (11 August 1706 – 1 February 1756).
He was born in Stuttgart.
From 1795 until 1797 he was Duke of Württemberg.
Prince Frederick of Württemberg
Prince" Frederick" Charles Augustus of Württemberg( 21 February 1808 – 9 May 1870) was a General in the Army of Württemberg and the father of William II of Württemberg.
Frederick was a member of the Royal Family of Württemberg and a Prince of Württemberg.
Duke Alexander of Württemberg (1771–1833)
Duke Alexander of Württemberg
(Mömpelgard/Montbéliard, then Württemberg (now France), 5 May 1771 – Gotha, Thuringia, Germany, 4 July 1833) was a Duke of Württemberg.
The son of Frederick II Eugene, Duke of Württemberg and of Sophia Dorothea of Brandenburg-Schwedt.
His sister Sophie Dorothea married Tsar Paul I of Russia.
Princess Friederike of Brandenburg-Schwedt
Friederike of Brandenburg-Schwedt (Friederike Sophia Dorothea; 18 December 1736 – 9 March 1798) was Duchess of Württemberg by marriage to Frederick II Eugene, Duke of Württemberg.
She is an ancestor to many European royals of the 19th and 20th century.
Duke Ferdinand Frederick Augustus of Württemberg
Duke Ferdinand Frederick Augustus of Württemberg( 22 October 1763 – 20 January 1834) was the fifth son of Frederick II Eugene, Duke of Württemberg and a Habsburg Austrian general during the French Revolutionary Wars and Napoleonic Wars.
As a high- ranking nobleman, he started his military career as an Oberstleutnant in 1781.
Promoted to General- major in 1788, he fought at Belgrade during the Austro- Turkish War.
During the War of the First Coalition he led his troops at Neerwinden and was in command of the successful Siege of Condé in 1793.
In March 1796 Württemberg was promoted to Feldzeugmeister, but after he was defeated by the French at Altenkirchen that June, Archduke Charles, Duke of Teschen removed him from command.
He was promoted to Feldmarschall in 1805 but for the remainder of his military career he held commands in the interior.
He was Proprietor( Inhaber) of one Austrian infantry regiment from 1785 to 1809, then a second infantry regiment from 1809 until his death in 1834.
His eldest brother became King Frederick I of Württemberg and a younger brother Duke Alexander of Württemberg was a general officer in the service of the Russian Empire.
Duke Louis of Württemberg
Duke Louis of Württemberg(" Ludwig Friedrich Alexander")
( Treptow an der Rega, 30 August 1756 – Kirchheim unter Teck, 20 September 1817) was the second son of Frederick II Eugene, Duke of Württemberg( 1732 – 1797) and Margravine Sophia Dorothea of Brandenburg- Schwedt( 1736 – 1798).
His elder brother was Frederick I, the first King of Württemberg, his sister was the Russian Empress consort, Maria Feodorovna.
Louis retained the pre-royal title of Duke.

Question: When did Frederick Ii Eugene, Duke Of Württemberg's father die?
Answer: 12 March 1737