Archduke Karl Ludwig of Austria
Archduke Karl Ludwig Joseph Maria of Austria( 30 July
1833 – 19 May 1896) was the younger brother of Franz Joseph I of Austria( 1830 – 1916), the father of Archduke Franz Ferdinand of Austria( 1863 – 1914), whose assassination ignited World War I, and grandfather of the last emperor, Charles I.
Archduchess Dolores of Austria
Archduchess Dolores of Austria;( 5 May 1891 – 10 April 1974) was a daughter of Archduke Leopold Salvator of Austria.
She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.
After the fall of the Austro Hungary Empire, she lived under reduced circumstances with her family in Spain, Austria, and Italy.
She died unmarried.
Archduke Franz Karl of Austria
Archduke Franz Karl Joseph of Austria (17 December 1802 – 8 March 1878) was a member of the House of Habsburg-Lorraine.
He was the father of two emperors:
Franz Joseph I of Austria and Maximilian I of Mexico.
Through his third son Karl Ludwig, he was the grandfather of Archduke Franz Ferdinand of Austria – whose assassination sparked the hostilities that led to the outbreak of World War I – and the great-grandfather of the last Habsburg emperor Karl I.
Archduke Maximilian of Austria-Este
Archduke Maximilian Joseph of Austria- Este( July 14, 1782 – June 1, 1863), the fourth son of Archduke Ferdinand of Austria- Este and younger brother of Francis IV, Duke of Modena.
He was grand master of the Teutonic Knights from 1835 to 1863.
Archduchess Maria Anna of Austria (1835–1840)
Archduchess
Maria Anna of Austria( 27 October 1835 – 5 February 1840), was by birth an Archduchess of Austria and member of the House of Habsburg.
She was the fourth child and only daughter of Archduke Franz Karl of Austria and his wife, Princess Sophie of Bavaria, daughter of Maximilian I Joseph of Bavaria and his second wife Caroline of Baden.
Leopold I, Holy Roman Emperor
Leopold I (full name: "Leopold Ignaz Joseph Balthasar Felician"; ; 9 June 1640 – 5 May 1705) was Holy Roman Emperor, King of Hungary, Croatia, and Bohemia.
The second son of Ferdinand III, Holy Roman Emperor, by his first wife, Maria Anna of Spain, Leopold became heir apparent in 1654 by the death of his elder brother Ferdinand IV.
Elected in 1658, Leopold ruled the Holy Roman Empire until his death in 1705, becoming the longest-ruling Habsburg emperor (at 46 years and 9 months).
Leopold's reign is known for conflicts with the Ottoman Empire in the east and rivalry with Louis XIV, a contemporary and first cousin, in the west.
After more than a decade of warfare, Leopold emerged victorious from the Great Turkish War thanks to the military talents of Prince Eugene of Savoy.
By the Treaty of Karlowitz, Leopold recovered almost all of the Kingdom of Hungary, which had fallen under Turkish power in the years after the 1526 Battle of Mohács.
Leopold fought three wars against France: the Franco-Dutch War, the Nine Years' War, and the War of the Spanish Succession.
In this last, Leopold sought to give his younger son the entire Spanish inheritance, disregarding the will of the late Charles II.
Leopold started a war that soon engulfed much of Europe.
The early years of the war went fairly well for Austria, with victories at Schellenberg and Blenheim, but the war would drag on until 1714, nine years after Leopold's death, which barely had an effect on the warring nations.
When peace returned, Austria could not be said to have emerged as triumphant as it had from the war against the Turks.
Archduke Otto of Austria (1865–1906)
Archduke Otto Franz Joseph Karl Ludwig Maria of Austria (21 April 1865 – 1 November 1906) was the second son of Archduke Karl Ludwig of Austria (younger brother of Emperor Franz Joseph I of Austria) and his second wife, Princess Maria Annunciata of Bourbon-Two Sicilies.
He was the father of Charles I of Austria, the last Emperor of Austria.
Archduchess Immaculata of Austria
Archduchess Immaculata of Austria;( 9 September 1892 – 3 September 1971) was a daughter of Archduke Leopold Salvator of Austria.
She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.
After the fall of the Austro Hungarian Empire, she lived in exile, first in Barcelona and from the 1930s until the end of her life in Italy.
In 1932, she married an Italian aristocrat, Igino Neri-Serneri.
The couple remained childless.
Archduchess Elisabeth Franziska of Austria (1892–1930)
Archduchess Elisabeth Franziska Marie Karoline Ignatia Salvator (27 January 1892 – 29 January 1930) was the eldest daughter of Archduke Franz Salvator of Austria and Archduchess Marie Valerie of Austria.
Through her mother, she was a granddaughter of Emperor Franz Joseph I of Austria.
Archduke Leopold Joseph of Austria (1682–1684)
Archduke Leopold Joseph of Austria
(June 2, 1682 – August 3, 1684) was a son of
Emperor Leopold I and Archduke of Austria.
He died in infancy.

Question: Who is Archduke Leopold Joseph Of Austria (1682–1684)'s paternal grandfather?
Answer: Ferdinand III