Grand Duke Vladimir Alexandrovich of Russia
Grand Duke Vladimir Alexandrovich of Russia (22 April 1847 – 17 February 1909) was a son of Emperor Alexander II of Russia, a brother of Emperor Alexander III of Russia and the senior Grand Duke of the House of Romanov during the reign of his nephew, Emperor Nicholas II.
Grand Duke Vladimir followed a military career and occupied important military positions during the reigns of the last three Russian Emperors.
Interested in artistic and intellectual pursuits; he was appointed President of the Academy of Fine Arts.
He functioned as a patron of many artists and as a sponsor of the Imperial ballet.
During the reign of his father, Emperor Alexander II, he was made Adjutant-General, senator in 1868 and a member of the Council of State in 1872.
His brother, Alexander III, also promoted his career.
He became a member of the Council of Ministers, Commander of the Imperial Guards Corps and Military Governor of Saint Petersburg.
He tried to exert some influence over his nephew Tsar Nicholas II, but had to content himself with holding a rival court with his wife Grand Duchess Maria Pavlovna at his palace in Saint Petersburg.
The events of Bloody Sunday in 1905, while he was Military Governor of St Petersburg, tarnished his reputation.
During the last years of his life, the rift between his family and that of Nicholas II widened.
He died after a stroke in 1909.
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Prince Karl of Leiningen
Prince Karl Vladimir Ernst Heinrich of Leiningen( 2 January 1928 – 28 September 1990) was the younger son of Karl, 6th Prince of Leiningen( 1898 – 1946) and Grand Duchess Maria Kirillovna of Russia.
Maria was the daughter of Princess Victoria Melita of Edinburgh and Saxe- Coburg- Gotha and Cyril Vladimirovich, Grand Duke of Russia.
As such, Karl was a great- great- grandson of both Queen Victoria of Great Britain and Emperor Alexander II of Russia( as Victoria Melita and Cyril Vladimirovich were both grandchildren of Alexander II).
Nikolaus, Hereditary Grand Duke of Oldenburg
Nikolaus, Hereditary Grand Duke of Oldenburg( 10 August 18973 April 1970) was the eldest son of Frederick Augustus II, Grand Duke of Oldenburg, who was the last ruling Grand Duke of Oldenburg.
In 1931, Nikolaus succeeded to his father's titles and assumed the role of pretender to the Grand Duchy, until his death in 1970.
Grand Duke Kirill Vladimirovich of Russia
Grand Duke Kirill Vladimirovich of Russia, ("Kirill Vladimirovich Romanov"; – 12 October 1938) was a son of Grand Duke Vladimir Alexandrovich of Russia, a grandson of Emperor Alexander II and a first cousin of Nicholas II, Russia’s last Tsar.
Grand Duke Kirill followed a career in the Russian navy serving during twenty years in the Naval Guards.
He took part in the Russo-Japanese War, barely surviving the sinking of the battleship at Port Arthur in April 1904.
In 1905, he married his paternal first cousin, Princess Victoria Melita of Saxe-Coburg and Gotha.
They wed in defiance of Tsar Nicholas II prohibition.
In retaliation, the Tsar stripped Kirill of his offices and honors, also initially banishing the couple from Russia.
They had two daughters and settled in Paris before being allowed to visit Russia in 1909.
In 1910 they moved to Russia, where Nicholas II recognized their marriage.
During World War I, Grand Duke Kirill was appointed Commander of the Naval Depot of the Guards in 1915 and in 1916, he achieved the rank of rear Admiral in the Imperial Navy.
During the February Revolution of 1917, Kirill marched to the Tauride Palace at the head of the Naval Guards swearing allegiance to the Russian Provisional Government.
During the rule of the provisional governmental in the summer 1917, Kirill escaped to Finland where his wife gave birth to the couple's only son.
In exile they lived for some years among his wife's relatives in Germany, and from the late 1920s on an estate they bought in Saint-Briac.
With the murder of his cousins Tsar Nicholas II and Grand Duke Michael, Kirill assumed the headship of the Imperial Family of Russia and, as next in line to the throne as the Guardian of the Throne in 1924.
Kirill proclaimed himself emperor in exile in 1926.
He worked for the restoration of the monarchy from exile for the rest of his life, but his claims were contested by some factions of the monarchy movement in a division that continues until today.
He wrote a book of memoirs, "My Life in Russia's Service", published after his death.
His granddaughter, Grand Duchess Maria Vladimirovna, is the current claimant to the headship of the House of Romanov.
Grand Duke Nicholas Konstantinovich of Russia
Grand Duke Nicholas Constantinovich of Russia( 14 February 1850 – 26 January 1918) was the first- born son of Grand Duke Konstantin Nikolayevich and Grand Duchess Alexandra Iosifovna of Russia and a grandson of Nicholas I of Russia.
Louis II, Grand Duke of Baden
Louis II, Grand Duke of Baden( 15 August 1824 – 22 January 1858) was the son of Leopold I, Grand Duke of Baden and Sophie of Holstein- Gottorp, Princess of Sweden.
Louis succeeded his father as Grand Duke of Baden on 24 April 1852.
His brother Frederick acted as regent, because Louis suffered from mental illness.
However, in 1856, Frederick became grand duke as well.
He was also an honorary citizen of Karlsruhe.
Grand Duke Alexei Mikhailovich of Russia
Grand Duke Alexei Mikhailovich of Russia( Russian: Алексей Михайлович)( 28 December 1875 – 2 March 1895) was the sixth son and youngest child of Grand Duke Michael Nicolaievich of Russia and a first cousin of Alexander III of Russia.
He was destined to follow a career in the Russian Navy, but he died in his youth of tuberculosis.
Grand Duke Vyacheslav Konstantinovich of Russia
Grand Duke Vyacheslav Konstantinovich of Russia,( 13 July 1862 – 27 February 1879), was a Romanov grand duke and the youngest son of Grand Duke Konstantin Nikolayevich of Russia and his wife Princess Alexandra of Saxe- Altenburg.
The English form of his first name is Wenceslas.
Prince Dmitri Alexandrovich of Russia
Prince Dmitri Alexandrovich of Russia( 15 August 1901 – 7 July 1980) was the fourth son and fifth child of Grand Duke Alexander Mikhailovich of Russia and Grand Duchess Xenia Alexandrovna of Russia.
He was a nephew of Tsar Nicholas II of Russia.

Question: Who is Grand Duke Kirill Vladimirovich Of Russia's paternal grandfather?
Answer: Alexander II of Russia