Abdul-Vahed Niyazov
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Princess Alexandra of Saxe-Altenburg
Grand Duchess Alexandra Iosifovna of Russia (8 July 1830 – 6 July 1911), born Princess Alexandra Friederike Henriette of Saxe-Altenburg, was the fifth daughter of Joseph, Duke of Saxe-Altenburg and Amelie Theresa Luise, Duchess of Württemberg.
She is an ancestor of the British, Greek, Romanian, Yugoslavian and Spanish Royal Families through her elder daughter Olga.
Prince Igor Constantinovich of Russia
Prince Igor Constantinovich of Russia(" Игорь Константинович"; 10 June 1894 – 18 July 1918) was the sixth child of Grand Duke Constantine Constantinovich of Russia by his wife Elisaveta Mavrikievna née Princess Elisabeth of Saxe- Altenburg.
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.
Princess Milica of Montenegro
Princess Milica Petrović- Njegoš of Montenegro, also known as Grand Duchess Militza Nikolaevna of Russia,( 14 July 1866 – 5 September 1951) was a Montenegrin princess.
She was the daughter of King Nikola I Petrović- Njegoš of Montenegro and his wife, Milena Vukotić.
Milica was the wife of Grand Duke Peter Nikolaevich of Russia, the younger brother of Grand Duke Nicholas Nikolaevich of Russia, whose wife was Milica's sister, Anastasia.
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.
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.
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.
Prince Gabriel Constantinovich of Russia
Prince Gabriel Constantinovich of Russia( 15 July
1887 – 28 February 1955) was the second son of Grand Duke Konstantin Konstantinovich of Russia and his wife, Grand Duchess Elizabeth Mavrikievna of Russia.
A great- grandson of Tsar Nicholas I, he was born in Imperial Russia and served in the army during World War I.
He lost much of his family during the war and the Russian Revolution.
He narrowly escaped execution by the Bolsheviks and spent the rest of his life living in exile in France.
Aleksey Belevsky-Zhukovsky
Count Alexei Alexeevich Belevsky- Zhukovsky( 26 November 1871, Salzburg – c. 1931 Caucasus) was the son of Grand Duke Alexei Alexandrovich of Russia and Alexandra Vasilievna, Baroness Seggiano.
He was also, being the son of Grand Duke Alexei, a grandson of Alexander II of Russia.

Question: Who is Grand Duke Vyacheslav Konstantinovich Of Russia's maternal grandfather?