Title: Alexander I of Russia
Content:   Alexander was born at 10:45, on 23 December 1777 in Saint Petersburg, and he and his younger brother Constantine were raised by their grandmother, Catherine. He was baptized on 31 December in Grand Church of the Winter Palace by mitred archpriest Ioann Ioannovich Panfilov (confessor of Empress Catherine II), his godmother was Catherine the Great and his godfathers were Joseph II, Holy Roman Emperor and Frederick the Great. He was named after Saint Petersburg patron saint - Alexander Nevsky. Some sources allege that she planned to remove her son (Alexander's father) Paul I from the succession altogether. From the free-thinking atmosphere of the court of 
Title: Alexander I of Russia
Content:  Alexander I (23 December 1777 – 1 December 1825) was Emperor of Russia from 1801, the first King of Congress Poland from 1815, and the Grand Duke of Finland from 1809 to his death. He was the eldest son of Emperor Paul I and Sophie Dorothea of Württemberg. The son of Grand Duke Paul Petrovich, later Paul I, Alexander succeeded to the throne after his father was murdered. He ruled Russia during the chaotic period of the Napoleonic Wars. As prince and during the early years of his reign, Alexander often used liberal rhetoric, but continued Russia's absolutist policies in practice. In the first years of his reign, he initiated some minor social reforms and (in 1803–04) major liberal educational 
Title: Alexander I of Russia
Content:  Alexander became Emperor of Russia when his father was assassinated 23 March 1801. Alexander, then 23 years old, was in the palace at the moment of the assassination and his accession to the throne was announced by General Nicholas Zubov, one of the assassins. Historians still debate Alexander's role in his father's murder. The most common theory is that he was let into the conspirators' secret and was willing to take the throne but insisted that his father should not be killed. Becoming emperor through a crime that cost his father's life would give Alexander a strong sense of remorse and shame. Alexander I succeeded to the throne on 23 March 1801 and was crowned in the Kremlin on 15 September of that year.
Title: Grand Duke Alexander Alexandrovich of Russia
Content:  Grand Duke Alexander Alexandrovich of Russia (Russian: Великий Князь Александр Александрович Романов; 7 June 1869 – 2 May 1870) was the infant son of then-Tsesarevich Alexander Alexandrovich and his wife, Tsesarevna Maria Feodorovna. Grand Duke Alexander's father was heir apparent to the Russian throne as the eldest living son of Emperor Alexander II of Russia. The Grand Duke was Alexander and Marie's second child, second son, and the younger brother of the future Emperor Nicholas II. Though his father eventually succeeded to the Russian throne as Alexander III, Grand Duke Alexander died before this. He died of meningitis in 1870, one month before his first birthday. Following his death, his mother wrote to her own mother, Queen Louise of Denmark: "The doctors maintain he did not suffer, but we suffered terribly to see and hear him."
Title: Alexander II of Russia
Content:   Born in Moscow, Alexander Nikolayevich was the eldest son of Nicholas I of Russia and Charlotte of Prussia (daughter of Frederick William III of Prussia and of Louise of Mecklenburg-Strelitz). His early life gave little indication of his ultimate potential; until the time of his accession in 1855, aged 37, few imagined that posterity would know him for implementing the most challenging reforms undertaken in Russia since the reign of Peter the Great. His uncle Emperor Alexander I died in 1825 and since Alexander marriage was childless and the renouncation of Grand Duke Konstantin in Warsaw, made Alexander father the new Emperor as Nicholas I and Alexander as Tsesarevich. in the period of his life as heir apparent (1825 to 1855), the 
Title: Alexander III of Russia
Content:   Grand Duke Alexander Alexandrovich was born on 10 March 1845 at the Winter Palace in Saint Petersburg, Russian Empire, the second son and third child of Tsesarevich Alexander (Future Alexander II) and his first wife Maria Alexandrovna (née Princess Marie of Hesse). He was born during the reign of his grandfather Nicholas I. In disposition, Alexander bore little resemblance to his soft-hearted, liberal father, and still less to his refined, philosophic, sentimental, chivalrous, yet cunning great-uncle Emperor Alexander I, who could have been given the title of "the first gentleman of Europe". Although an enthusiastic amateur musician and patron of the ballet, Alexander was seen as lacking refinement and elegance. 
Title: Alexei Petrovich, Tsarevich of Russia
Content:  Grand Duke Alexei Petrovich of Russia (28 February 1690 – 7 July 1718) was a Russian Tsarevich. He was born in Moscow, the son of Tsar Peter I and his first wife, Eudoxia Lopukhina. Alexei despised his father and repeatedly thwarted Peter's plans to raise him as successor to the throne. His brief defection to Austria scandalized the Russian government, leading to harsh repressions against Alexei and his associates. Alexei died after interrogation under torture, and his son Peter Alexeyevich became the new heir apparent.
Title: Prince Alexander of Imereti (1674–1711)
Content:  Alexander and his son, Mamuka (Matvey) (died in 1693), were brought by their father, Archil, to Moscow on 10 August 1684. They were raised at the court under the auspices of Knyaz Fedul Volkonsky and Dyak Ivan Kazarinov. Alexander was befriended by the young Russian Tsar Peter I, whom he joined in his war games. On 30 July 1688, Alexander and Mamuka left Moscow to join their father in his eventually failed attempt to recover the lost throne of Imereti. Back in Russia in 1692, Alexander followed Peter in the Grand Embassy to Europe in 1697 and was sent to The Hague to study gunnery and related sciences. He stayed there until 1699, after which he visited his father at a Russian military settlement on the Terek delta before returning to Moscow. On 19 May 1700 he became the first Russian officer to be promoted to the rank of General Feldzeugmeister and appointed the chief of the Pushkarsky Prikaz (literally, "cannon administration").
Title: Duke Alexander of Oldenburg
Content:  Duke Alexander Frederick Constantin of Oldenburg (Herzog Alexander Friedrich Konstantin von Oldenburg; Алекса́ндр Петро́вич Ольденбу́ргский, Alexander Petrovich Oldenburgsky; – 6 September 1932) was the second son of Duke Peter of Oldenburg and his wife Princess Therese of Nassau-Weilburg. Though he had a German title and ancestry, Alexander and his siblings were born and raised in St. Petersburg as the grandchildren of Grand Duchess Catherine Pavlovna of Russia. Alexander served as Adjutant general to Alexander III of Russia, and also as commanding general of the Imperial Guard. Alexander was the Russian candidate submitted to succeed Alexander, Prince of Bulgaria, though this nomination failed to gain the support of the other great European powers. At the outbreak of World War I, Nicholas II of Russia appointed 
Title: Alexander
Content: Alexander I of Russia (1777–1825), emperor of Russia ; Alexander II of Russia (1818–1881), emperor of Russia ; Alexander III of Russia (1845–1894), emperor of Russia ; Alexander Karađorđević, Prince of Serbia (1842–1858) ; Alexander of Bulgaria (1857–1893), first prince of modern Bulgaria ; Alexandru Ioan Cuza, first prince of unified Romania (1859–1866) ; Alexander I Obrenović of Serbia (1876–1903), king of Serbia ; Alexander, Prince of Lippe (1831–1905), prince of Lippe ; Alexander I of Yugoslavia (1888–1934), first king of Yugoslavia ; Alexander, Crown Prince of Yugoslavia (born 1945), head of the Yugoslav Royal Family ; Zog I, also known as Skenderbeg III (1895–1961), king of Albanians ; Alexander of Greece (1893–1920), king of Greece ; Leka, Crown Prince of Albania (1939–2011), king of Albanians (throne pretender) ; Willem-Alexander, King of the Netherlands (born 1967), eldest child of Queen Beatrix and Prince Claus 

Question: Who is the father of Alexander I of Russia?
Answer: Paul I of Russia.
Pavel I.
Emperor of Russia Paul I.
zar di Russia Pavel I.
Zar Paul I. Russland.
emperor of Russia Paul.
empereur de Russie Paul I.
Pablo Primero.
tsaar van Rusland Pavel I.
Emperor of Russia Pavel Petrovich.
Paul the First of Russia.
Emperor of Russia Pavel I.
Emperor of Russia Paul Petrovitch.
Paul I.