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The Blank family is a family of Jews, some of whom converted to Orthodox Christianity in the Russian Empire, mostly notable as the immediate ancestry of the maternal grandfather of Vladimir Lenin according to various published researchers who suggest that Lenin's maternal grandfather was a Jewish convert to Christianity (Alexander Blank). Whether or not Lenin, whose matrilineal "Blank" surname also traces to non-Jewish German roots, was actually partly descended from the Jewish Blank family remains contested.
Moshe (Dmitry) Blank
Moshe Itzkovich Blank (Russian: Моше Ицкович Бланк) baptized as Dmitry Blank (c.a. 1758- after 1844) was a Jewish vodka-franchised tavern keeper from Shtetl Starokonstantynów, Volhynian Voivodeship (now Ukraine). His tavern in Starokonastantinovo brought him around 10 silver roubles.[clarification needed] He also rented a plot of land in Novohrad-Volynskyi uyezd, Volhynian Governorate where he grew chicory. He sent his sons into a secular Russian school instead of a traditional religious Jewish cheder which was unusual in those times.
Most of his life story is known through the documents related to his complicated feud with the local kahal. In 1803, the kahal accused Moshe of stealing hay; in 1805, they accused him of selling cheaper ordinary vodka as a more expensive "fruit vodka" brand. The official courts cleared Moshe on both counts. In 1806, Moshe, in turn, accused the kahal of shielding local Jews from taxes and their children from conscription into the Russian Army. In 1808, 22 local Jews accused Moshe Blank of arson that destroyed or damaged many houses in Starokonastantinovo, including the Blanks' own house. Some researchers believe that the arson charges were true and that Blank indeed was a pyromaniac, while other consider the charges as a false report done as a revenge for his reports. In 1809, Novohrad-Volynian magistrate cleared Blank from the arson charges, but the family had to move to Zhitomir.
In August 1816, Blank wrote a letter to the Emperor Nicholas complaining that he is persecuted by the kahal because of his fight for the true Judaism free from what he saw as superstitions and nationalistic excesses. The letter was intercepted by the local administration and was not delivered to the addressee. In November 1816, Moshe Blank sued his son, Abel Blank, alleging that his son had beaten and verbally abused him over a monetary dispute - Moshe promised to pay some dowry after Abel's marriage but changed his mind afterwards. Abel was arrested and threatened with an exile to Siberia, but eventually after Blanks neighbors gave the best possible character assessment to the son and the worst possible to the father, Abel was cleared from the charges and Moshe fined for the false report.
On 10 July 1820, in Saint Petersburg, two sons of Moshe: Abel and Srul were baptized in the Orthodox Christianity. At the time in Russia, conversion of Jews was a rare and a high profile event. The godfathers of the sons were senator Dmitry Baranov and the Actual Privy Counsellor Alexander Apraksin. Both of the sons were named after their godfathers and received patronymics after Dmitry Baranov. Thus Abel Moshevich became Dmitry Dmitrievich and Srul Moshevich became Alexander Dmitrievich. The same year, the brothers were admitted to the Saint Petersburg Academy of Medical Surgeons (Петербургская Медико-Хирургическая Академия). According to the customs of the time, conversions to Christianity meant breaking of the family connections.
In 1825, Moshe Blank finally won his litigation with the Starokonstantinovo Jews; he received more than 15 thousand roubles distributed among the 22 plaintiffs as a compensation for his losses, while 11 of the plaintiffs were imprisoned for libel. The lucky turn of the litigation was probably influenced by the powerful godfathers of Moshe's sons 
On 1 January 1845, at the age of 86, Moshe Blank also converted to Christianity. He was baptized Dmitry, probable matching the patronymics of his sons. He wrote letters to the Emperor Nicholas I (there are known letters of 7 June 1845 and 18 September 1846 acknowledging that he had broken with the Jews for 40 years but could only convert after the death of his "very religious wife". In his letters, he advocated to significantly tighten the limitation for the religious Jews: to forbid prayers for the coming of Moshiach, but instead require every Saturday to pray for the Tsar and his family; to forbid Hasidic Judaism and visits of Jewish houses by rabbis; to forbid non-Jews employed by the Jews to work on Saturdays and so on. According to Blank, the new requirements would greatly increase conversion of the Jews and would make Government payments of 30 roubles to each convert unnecessary.
There is no information on the last years of Moshe Blank.
Abel (Dmitry) Blank
Abel Moshevich Blank (Russian: Абель Мошевич Бланк) baptized as Dmitry Dmitrievich Blank after his godfather senator Dmitry Baranov (1794-26 June 1831) was a Russian-Jewish medical doctor, son of Moshe (Dmitry) Blank.
After his conversion to Russian Orthodox Church, in 1820, Dmitry was admitted to the Saint Petersburg Academy of Medical Surgeons which he graduated in 1824. Dmitry worked as a medical doctor and was murdered 26 June 1831 during the infamous Cholera Mutiny in Saint Petersburg: the lynching mob decided that the cholera epidemic in the city was caused by the actions of the medical doctors and quarantine officials. Among the murdered, there was doctor Dmitry (Abel) Blank who was defenestrated by the mob from his own office on the third floor of the Central Cholera Hospital.
Srul (Alexander) Blank
Srul Moshevich Blank (Russian: Сруль Мошевич Бланк) also spelled Israil Moiseevich Blank (Russian: Израиль Моисеевич Бланк) baptized Alexander Dmitrievich Blank (Александр Дмитриевич Бланк); (1804 - 17 July 1870) was a Russian medical doctor and a landowner, the younger son of Moshe Blank and a grandfather of Vladimir Lenin.
According to the mainstream theory, Srul was born in Starokonstantinovo and converted to Orthodox Christianity together with his brother in Saint Petersburg in 1820. He was baptized Alexander, after his godfather Actual Privy Counsellor Alexander Ivanovich Apraksin, and got the patronymic Dmitrievich after his brother's godfather, Dmitry Baranov. 24 July 1824 Alexander enters the Saint Petersburg Academy of Medical Surgeons.
On 19 July 1824, Alexander Blank graduated from medical school with a diploma as surgeon-obstetrician. He worked in the town of Porechye Smolensk Governorate. Soon, he returned to Saint Petersburg and worked as a police medical doctor, then in the Naval Department; in 1837, he started to work in Mariinsky Hospital. In 1842, he moved to Perm, then Zlatoust.
In 1847, he retired from the practice of medicine and bought the estate of Kokushkino or Yañasala (now Lenino-Kokushkino) in Tatarstan with 39 male serfs, where he lived until his death in 1870. In 1887-1888, Vladimir Lenin was exiled to his grandfather's estate.
Alexander Blank was a doctor of the great Ukrainian poet Taras Shevchenko. In 1837, in Saint Petersburg, he reportedly saved Shevchenko (then a young pupil of artist Shiryayev) from a dangerous illness. Later, in 1850s, during his exile to Nizhny Novgorod, Shevchenko was afflicted with an "indecent illness out of his romance with actress Pekunova" (most probably a sort of a sexually transmitted disease). Shevchenko sent for the retired doctor Alexander Blank who was able to cure him.
Alexander Blank married twice. His first wife was Anna Großschopf (Анна Ивановна Гроссшопф). They had one son, Dmitry, who committed suicide at the age of 19 because of a gambling debt and five daughters: Anna, Lyubov, Yekaterina, Maria and Sofia. Each of the five daughters married a school teacher and left five to ten children. The fourth daughter, Maria married Ilya Ulyanov and became mother of Vladimir Lenin.
Anna Großschopf's ancestors came from Northern Germany and that branch of family produced many notable Germans that were discovered to be blood relatives of Vladimir Lenin. Among them are Nazi field marshal Walter Model, German archeologist Ernst Curtius, President of Germany Richard von Weizsäcker and many others
The Blank daughters married becoming Veretennikova, Ulyanova, Zalezhsky, Lavrova, and Ardasheva. All of those families had many children. Currently, there are known 130 descendants of Alexander Blank.
The most notable is the family of Maria Alexandrovna Blank who married Ilya Ulyanov, parents of Vladimir Lenin (born Vladimir Ulyanov), and other notable revolutionaries. Lenin's quarter-Jewish heritage tends to be spotlighted by authors who subscribe to the antisemitic Jewish Bolshevism conspiracy theory linking Zionism and Communism while many Soviet ideologists tried to omit or hide the likelihood of Jewish genealogical connections to Vladimir Lenin.
Victor Ardashev, a first cousin of Vladimir Lenin was a member of the Constitutional Democratic Party from Verkhoturye, Perm Governorate. After the dispersion of the Russian Constituent Assembly, he published a critical proclamation and was murdered (under pretext of attempts to escape) by Yakov Yurovsky in February 1918. Incidentally, the same Yurovsky was the chief executioner of the last Russian Emperor Nicholas II.
Georgy Ardashev, a son of Alexander Ardashev and a first cousin once removed of Vladimir Lenin, was a Praporshchik and a commander of a cavalry squadron in Yekaterinburg garrison. In 1918, he refused to disperse an anti-Bolshevik soldier assembly and was executed by Cheka the same night.
Nicholas Pervukhin, a grandson of Zalezhsky and another Lenin's first cousin once removed, was arrested by Cheka and allowed to emigrate to Canada after a letter from Dmitri Ulyanov, a younger brother of Vladimir Lenin, who at that time stopped all the revolutionary activities and worked as a medical doctor. It appeared that Cheka mixed up Dmitri with Vladimir Lenin. He later worked for the United Nations as a Russian interpreter and incidentally provided the synchronized translation during the famed Nikita Khrushchev's shoe-banging incident.
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