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.
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 Anna Elisabeth Louise of Brandenburg-Schwedt
Princess and Margravine Anna Elisabeth Louise of Brandenburg- Schwedt( 22 April 1738 – 10 February 1820) was a Prussian princess.
She was a daughter of Margrave Frederick William of Brandenburg- Schwedt and his wife, Princess Sophia Dorothea of Prussia.
George I of Great Britain
George I (George Louis; ; 28 May 1660 – 11 June 1727) was King of Great Britain and Ireland from 1 August 1714 and ruler of the Duchy and Electorate of Brunswick-Lüneburg (Hanover) in the Holy Roman Empire from 23 January 1698 until his death in 1727.
He was the first British monarch of the House of Hanover.
Born in Hanover to its Elector Ernest Augustus and Electress Sophia, George inherited the titles and lands of the Duchy of Brunswick-Lüneburg from his father and uncles.
A succession of European wars expanded his German domains during his lifetime; he was ratified as prince-elector of Hanover in 1708.
After the deaths in 1714 of his mother and his second cousin Anne, Queen of Great Britain (r. 1702–1714), George ascended the British throne as Anne's closest living Protestant relative under the Act of Settlement 1701.
Jacobites attempted, but failed, to depose George and replace him with James Francis Edward Stuart, Anne's Catholic half-brother.
During George's reign, the powers of the monarchy diminished and Britain began a transition to the modern system of cabinet government led by a prime minister.
Towards the end of his reign, actual political power was held by Robert Walpole, now recognised as Britain's first "de facto" prime minister.
George died of a stroke on a trip to his native Hanover, where he was buried.
He is the most recent British monarch to be buried outside the United Kingdom.
Princess Friederike Luise of Prussia
Princess Friederike Luise of Prussia( 29 August 1714 – 4 February 1784) was a daughter of Frederick William I of Prussia and Sophia Dorothea of Hanover and Margravine of Brandenburg- Ansbach.
George William, Duke of Saxe-Lauenburg
George William( Herzberg am Harz, 26 January 1624 – 28 August 1705, Wienhausen) was the first Welf Duke of Lauenburg after its occupation in 1689.
From 1948 to 1965, he was the ruler of the Principality of Calenberg as an appanage from his eldest brother, Christian Louis, Prince of Luneburg.
When he inherited Luneburg on the latter's death in 1965, he gave Calenberg to his younger brother, John Frederick.
Nevertheless, he only kept the sub-division of Celle, giving the rest of Luneburg to their youngest brother Ernest Augustus, whose son, George Ludwig( future King of Great Britain), inherited Saxe- Lauenburg and Celle from George William.
His only daughter, Sophia Dorothea of Celle, was George Ludwig's wife.
Anna Amalia, Abbess of Quedlinburg
Princess Anna Amalia of Prussia (9 November 1723 – 30 March 1787) was Princess-Abbess of Quedlinburg.
She was one of ten surviving children of King Frederick William I of Prussia and Sophia Dorothea of Hanover.
Éléonore Desmier d'Olbreuse
Éléonore Marie Desmier d'Olbreuse (3 January 1639 – 5 February 1722) was the wife of George William, Duke of Lauenburg and Prince of Celle.
She was the mother of Sophia Dorothea of Celle, who was the wife of George I of Great Britain.
Thus she is the maternal grandmother of George II.
Sophia Dorothea of Hanover
Sophia Dorothea of Hanover( – 28 June 1757) was a Queen consort in Prussia as spouse of Frederick William I.
She was the sister of George II, King of Great Britain, and the mother of Frederick II, King of Prussia.
Sophia Dorothea of Celle
Sophia Dorothea of Brunswick-Lüneburg-Celle (15 September 1666 – 13 November 1726) was the repudiated wife of future King George I of Great Britain, and mother of George II.
The union with her first cousin was an arranged marriage of state, instigated by the machinations of his mother, Electress Sophia of Hanover.
She is best remembered for her alleged affair with Philip Christoph von Königsmarck that led to her being imprisoned in the Castle of Ahlden for the last thirty years of her life.

Question: What is the cause of death of Sophia Dorothea Of Celle's husband?
Answer: stroke