Prince Nikita Alexandrovich of Russia
Prince Nikita Alexandrovich of Russia (13 January 1900 – 12 September 1974) was the third son and fourth 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.
Born in Imperial Russia during the reign of his uncle, Prince Nikita escaped the fate of many of his relatives who were killed by the Bolsheviks.
He left Russia in April 1919, at age nineteen.
In 1922 he married Countess Maria Vorontsova-Dashkova.
The couple had two children.
Irina Paley
Princess Irina Pavlovna Paley( 21 December 1903 – 15 November 1990) was the daughter of Grand Duke Paul Alexandrovich of Russia and his second wife, Olga Valerianovna Karnovich.
Nikita Nekrasov
Nikita Alexandrovich Nekrasov( born 10 April 1973) is a mathematical physicist and string theorist at Stony Brook University in New York, and a Professor of the Russian Academy of Sciences.
Grand Duchess Xenia Alexandrovna of Russia
Grand Duchess Xenia Alexandrovna of Russia (– 20 April 1960) was the elder daughter and fourth child of Tsar Alexander III of Russia and Empress Maria Feodorovna of Russia
(née Princess Dagmar of Denmark) and the sister of Emperor Nicholas II.
She married a cousin, Grand Duke Alexander Mikhailovich of Russia, with whom she had seven children.
She was the mother-in-law of Felix Yusupov and a cousin of Grand Duke Dmitri Pavlovich of Russia who, together, killed Grigori Rasputin, holy healer to her nephew, the haemophiliac Tsarevich Alexei Nikolaevich of Russia.
During her brother's reign she recorded in her diary and letters increasing concern about his rule.
After the fall of the monarchy in February 1917, she fled Russia, eventually settling in the United Kingdom.
Her grandson Prince Andrew Andreevich has been a head of the Romanov Family since December 2016.
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.
Princess Olga Paley
Princess Olga Valerianovna Paley( 2 December 1865 – 2 November 1929) was the morganatic second wife of Grand Duke Paul Alexandrovich of Russia.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Prince Nikita Romanov
Prince Nikita Nikitich Romanov( 13 May 1923 – 3 May 2007) was a British born, American historian and writer, author of a book about Ivan the Terrible.
He was a member of the Romanov family, a son of Prince Nikita Alexandrovich of Russia and a great nephew of Nicholas II of Russia, the last Tsar.
Abdul-Vahed Niyazov
' of Russia.
Prince Alexander Romanov
Prince Alexander Nikitich Romanov( 4 November 1929 – 22 September 2002) was a member of the Romanov family.
He was a son of Prince Nikita Alexandrovich of Russia and a great nephew of Nicholas II of Russia, the last Tsar.
Born in France, he took British citizenship in 1938 and lived with his grand mother Grand Duchess Xenia Alexandrovna in England until her death in 1960.
The following year, Prince Alexander Nikitich became the first member of the Romanov family to visit Russia after the Revolution.

Question: Who is Prince Nikita Alexandrovich Of Russia's maternal grandfather?
Answer: Alexander III of Russia