Józef Kosacki
Józef Stanisław Kosacki( 1909 – 1990) was a Polish professor engineer, inventor, and an officer in the Polish Army during World War II.
He is best known as the inventor of the Polish mine detector, the first man-portable mine detector, whose basic design has been in use with various armies for over 50 years.
Stanisław Poniatowski
Stanisław Poniatowski was the name of several Polish nobles:
Nina Andrycz
Nina Andrycz( 11 November 1912 – 31 January 2014) was a Polish actress and the wife of Józef Cyrankiewicz.
She studied law at the Wilno University.
Eugeniusz Pławski
Eugeniusz Józef Stanisław Pławski (March 26, 1895 – May 23, 1972) was a Polish Navy officer who served in World War I and World War II.
He was the commander of the ORP Piorun (G65) during the hunt for Bismarck.
Where Was I
" Where Was I?" may refer to:
Józef Stanisław Poniatowski
Joseph Stanislaw August Friedrich
Joseph Telêmaco
Luci Poniatowski (9 November 1835 – 6 January 1908) was a Polish nobleman and son of Jozef Michal Poniatowski and Matilda Perotti.
He was married to Leopoldina Louise le Hon.
And they had three children:
Louis Leopold Poniatowski, Charles Joseph and Catherine Mathilda.
Wanda Piłsudska
Wanda Piłsudska (7 February 1918 – 16 January 2001) was a daughter of Józef Piłsudski, and a psychiatrist by profession.
Kajetan Kraszewski
Kajetan Kraszewski( 1827–1896) was the younger brother of Józef Ignacy Kraszewski.
He is the author of numerous novels and plays, as well as a history of the Kraszewski family.
Aleksandra Piłsudska
Aleksandra Piłsudska (Suwałki, 12 December 1882 – London, 31 March 1963), née Szczerbińska, was the second wife of Józef Piłsudski.
Józef Michał Poniatowski
Józef Michał Poniatowski
(Rome, July 24, 1814 – London, July 4, 1873) was a Polish "szlachcic", a composer and an operatic tenor.
He was the nephew of the Polish general Prince Józef Antoni Poniatowski.
He was created the 1st "Conte di Monte Rotondo" on November 20, 1847, and the first "Principe di Monte Rotondo" on November 19, 1850 by Grand Duke of Tuscany Lepold II.

Question: Where did Józef Stanisław Poniatowski's father die?
Answer: London