Question: Which grandson of Emperor Nicholas 1 was the father of Princh John Konstantinovich of Russia?

Documents:
source: Grand Duke Konstantin Konstantinovich of Russia
text: Grand Duke Konstantin Konstantinovich of Russia Grand Duke Konstantin Konstantinovich of Russia (Russian: Константи́н Константи́нович ; ] ; 22 August 1858 in Strelna – 15 June 1915 in Pavlovsk) was a grandson of Emperor Nicholas I of Russia, and a poet and playwright of some renown. He wrote under the pen name "K.R.", initials of his given name and family name, Konstantin Romanov.

source: Prince John Konstantinovich of Russia
text: Prince John Konstantinovich of Russia Prince Ioann Konstantinovich of Russia (Russian: Иоанн Константинович ) (5 July 1886 – 18 July 1918), sometimes also known as Prince John, Prince Ivan or Prince Johan, was the eldest son of Grand Duke Konstantin Konstantinovich of Russia by his wife Yelizaveta Mavrikievna, née Princess Elisabeth of Saxe-Altenburg. He was described by contemporaries as a gentle, religious person, nicknamed "Ioannchik" by his relatives.

source: Charles Sydney Gibbes
text: Charles Sydney Gibbes Charles Sydney Gibbes (19 January 1876 – 24 March 1963) was a British academic who from 1908 to 1917 served as the English tutor to the children of Emperor Nicholas II of Russia. When Nicholas abdicated the throne in March 1917 Gibbes voluntarily accompanied the Imperial family into exile to the Siberian village of Tobolsk. After the family was murdered in 1918 Gibbes returned to the United Kingdom and eventually became an Orthodox monk, adopting the name of "Nicholas" in commemoration of Nicholas II. He died in 1963, and is buried at Headington cemetery, Oxford, Oxfordshire, England.

source: Grand Duke Sergei Alexandrovich of Russia
text: Grand Duke Sergei Alexandrovich of Russia Grand Duke Sergei Alexandrovich of Russia ("Сергей Александрович"; May 11, 1857 – February 17, 1905) was the fifth son and seventh child of Emperor Alexander II of Russia. He was an influential figure during the reigns of his brother Emperor Alexander III of Russia and his nephew Emperor Nicholas II, who was also his brother in law through Sergei's marriage to Elizabeth the sister of Tsarina Alexandra.

source: Grand Duchess Xenia Alexandrovna of Russia
text: Grand Duchess Xenia Alexandrovna of Russia Grand Duchess Xenia Alexandrovna of Russia (Russian: Ксения Александровна Романова ; 6 April [O.S. 25 March] 1875 – 20 April 1960) was the elder daughter and fourth child of Emperor 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.

source: Konstantin Rudanovsky
text: Konstantin Rudanovsky Konstantin Vasilyevich Rudanovsky. Graduated first Cadet Corpsand The Nikolaev Academy of the General Staff in Saint Petersburg, was a general who served Russian Emperor Nicholas I in Paris. Konstantin was a passionate collector and always hunted for masterpieces in France and Italy in order to re-sell it in Russia. On one occasion he even sold a large portrait of Nicholas I to the tsar himself. A few years later, Konstantin met Charles de Morny, the ambassador of France to Russia. Morny was married to Sophia Trubetskaya (the illegitimate daughter of Tsar Nicholas I). The couple became friends with Konstantin and from time to time they bought works of art and jewelry from him. Rudanovsky became well known among top art dealers in Paris and had a serious reputation after the sale of the Sancy Diamond. He and Sofia Sergeyevna Trubetskaya often discussed the idea of creating a cultural centre, or a gallery where Konstantin would be able to exhibit his art collections. One day Sophia said: "I want to build an island of Russian culture in France". This idea was very important to Konstantin and he suggested Monry to make a magnificent gift to his wife Sophia for a birthday. Monry built the seaside town of Deauville to celebrate their love. Deauville in fact became for many years the epicenter for Russian culture in France. In 1912 Deauville witnessed the golden age of the Diaghilev Ballet Company.

source: Grand Duke Alexander Alexandrovich of Russia
text: Grand Duke Alexander Alexandrovich of Russia Grand Duke Alexander Alexandrovich of Russia (Russian: Великий Князь Александр Александрович Романов; 7 June 1869 – 2 May 1870) was the infant son of Emperor Alexander III–the heir apparent, styled "Tsesarevich", to the Russian throne as the eldest living son of Emperor Alexander II–and his consort, Marie Fyodorovna of Russia. He was Alexander and Marie's second child, second son, and the younger brother of the future Emperor Nicholas II. He died of meningitis in 1870, one month before his first birthday. "The doctors maintain he did not suffer, but we suffered terribly to see and hear him," his mother wrote to her own mother, Queen Louise of Denmark.

source: Prince Andrew Romanov
text: Prince Andrew Romanov Prince Andrew Andreyevich Romanov (born 21 January 1923) is a Russian American artist and author. He is a grand-nephew of Russia's last Emperor, Nicholas II. Since December 31, 2016 he is a claimant to the headship of the Imperial House of Russia and President of the Romanov Family Association. He is a great-great-grandson in the male-line of Emperor Nicholas I of Russia.

source: Princess Vera Constantinovna of Russia
text: Princess Vera Constantinovna of Russia Princess Vera Constantinovna of Russia, also Vera Konstantinovna (Russian: Вера Константиновна Романова ; 24 April 1906 – 11 January 2001), was the youngest child of Grand Duke Konstantine Konstantinovich of Russia and his wife, Grand Duchess Elizabeth Mavrikievna. A great-granddaughter of Tsar Nicholas I of Russia, she was born in the Russian Empire and was a childhood playmate of the younger children of Emperor Nicholas II of Russia. She lost much of her family during World War I and the Russian Revolution. At age twelve, she escaped revolutionary Russia, fleeing with her mother and brother George to Sweden. She spent the rest of her long life in exile, first in Western Europe and from the 1950s in the United States.

source: Grand Duke Vladimir Alexandrovich of Russia
text: Grand Duke Vladimir Alexandrovich of Russia Grand Duke Vladimir Alexandrovich of Russia ("Влади́мир Александрович") ) (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.

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Answer: Grand Duke Konstantin Konstantinovich of Russia