Alexandra Feodorovna (Charlotte of Prussia)
Alexandra Feodorovna , born Princess Charlotte of Prussia (13 July 1798 – 1 November 1860), was Empress of Russia as the wife of Emperor Nicholas I .
Charlotte was the eldest surviving daughter of King Frederick William III of Prussia  and of Queen Louise of Prussia.
Her childhood was marked by the Napoleonic wars and by the death (1810) of her mother when Charlotte was just twelve years old.
In 1814 the Russian imperial family arranged her marriage – for political reasons – with Grand Duke Nicholas Pavlovich of Russia,
who later became Emperor Nicholas I.
The couple married on 1 July 1817.
Upon her marriage, Charlotte converted to Russian Orthodoxy, and took the Russian name "Alexandra Feodorovna".
Ideally matched with her husband, she had a happy marriage that produced a large family; seven of her children survived childhood.
Following the death of her brother-in-law, Emperor Alexander I of Russia, in December 1825, Alexandra's husband became the new Russian emperor.
Alexandra enjoyed her husband's confidence in affairs of state, but she had no interest in politics other than her personal attachment to Prussia, her native country.
She was the obedient and admiring supporter of her husband's views.
Her personality was completely overshadowed by Nicholas
I's strong character.
As empress, Alexandra Feodorovna had no interest in charity work.
Her chief interests were in family affairs, dancing, balls and jewels.
After 1841 her health deteriorated.
She spent long sojourns abroad in search of a respite to her illness.
As she became largely an invalid, Nicholas I took mistresses, but Alexandra retained her husband's love.
She survived Nicholas I by five years and died in 1860.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Marga Boodts
Marga Boodts (February 18, 1895 – October 13, 1976) was a woman who claimed to be Grand Duchess Olga Nikolaevna of Russia.
She was one of a considerable number of Romanov pretenders who emerged from various parts of the world following the execution of Tsar Nicholas II and his family at Yekaterinberg on July 18, 1918.
She stands out, however, as one of very few who claimed to have been Grand Duchess Olga, the Tsar's oldest daughter.
She was also known as Maria Bottcher.
Anatoly Ionov (Romanov claimant)
Anatoly Ionov( born 1936) is a Russian man who claims to be the son of Grand Duchess Anastasia Nikolaevna 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.
Valentina Chebotaryova
Valentina Ivanovna Chebotaryova( birth date unknown- April 23( O.S.)/ May 6( N.S.), 1919) recorded her impressions of work in a military hospital in Tsarskoye Selo, Russia during World War I in her journal.
Portions of the journal, which included her impressions of Tsarina Alexandra and of her daughters Grand Duchess Olga Nikolaevna of Russia and Grand Duchess Tatiana Nikolaevna of Russia were published in magazines, books, and in her son's memoirs after the war.
Abdul-Vahed Niyazov
' of Russia.
Olga Rubtsova
Olga Nikolaevna Rubtsova( 20 August 1909 – 13 December 1994) was a Soviet chess player and the fourth women's world chess champion.
Grand Duchess Alexandra Nikolaevna of Russia
Grand Duchess Alexandra Nikolaevna of Russia( 24 June 1825 – 10 August 1844) was the youngest daughter and fourth child of Tsar Nicholas I, Emperor of Russia, and his wife, Princess Charlotte of Prussia.
She was a younger sister of Tsar Alexander II of Russia.
Olga Nikolaevna of Russia
Grand Duchess Olga Nikolaevna of Russia (11 September 1822 – 30 October 1892) was a member of the Russian imperial family who became Queen consort of Württemberg.
She was the second daughter of Nicholas I of Russia and Charlotte of Prussia.
She was thus a sister of Alexander II of Russia.
She married Charles I of Württemberg, with whom she had no children.

Question: Who is the maternal grandfather of Olga Nikolaevna Of Russia?
Answer: Frederick William III of Prussia