Title: Saint Petersburg
Content:  culturally associated with the birth of the Russian Empire and Russia's entry into modern history as a European great power. It served as a capital of the Tsardom of Russia and the subsequent Russian Empire from 1713 to 1918 (being replaced by Moscow for a short period of time between 1728 and 1730). After the October Revolution in 1917, the Bolsheviks moved their government to Moscow. Saint Petersburg is known as the "Cultural Capital of Russia," and received over 15 million tourists in 2018. It is considered an important economic, scientific, cultural, and tourism centre of Russia and Europe. In modern times, the city has the nickname of the "Northern Capital" and serves as a home to some federal government 
Title: Saint Petersburg
Content:  Saint Petersburg, formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), is the second-largest city in Russia. It is situated on the Neva River, at the head of the Gulf of Finland on the Baltic Sea, with a population of roughly 5.4 million residents. Saint Petersburg is the fourth-most populous city in Europe, the most populous city on the Baltic Sea, as well as the world's northernmost city with over 1 million residents. As Russia's Imperial capital, and a historically strategic port, it is governed as a federal city. The city was founded by Tsar Peter the Great on 27 May 1703 on the site of a captured Swedish fortress, and was named after apostle Saint Peter. Saint Petersburg is historically 
Title: History of Saint Petersburg
Content:  Founded by Tsar Peter the Great on 27 May 1703. It became capital of the Russian Empire for more than two hundred years (1712–1728, 1732–1918). St. Petersburg ceased being the capital in 1918 after the Russian Revolution of 1917.
Title: Saint Petersburg
Content:  his life and a treason case involving his son. In 1728, Peter II of Russia moved his seat back to Moscow. But four years later, in 1732, under Empress Anna of Russia, Saint Petersburg was again designated as the capital of the Russian Empire. It remained the seat of the Romanov dynasty and the Imperial Court of the Russian Tsars, as well as the seat of the Russian government, for another 186 years until the communist revolution of 1917. In 1736–1737 the city suffered from catastrophic fires. To rebuild the damaged boroughs, a committee under Burkhard Christoph von Münnich commissioned a new plan 
Title: Emperor of all the Russias
Content:  subjects, bestowing divine authority upon the new ruler. As such, it was similar in purpose to other European coronation ceremonies from the medieval era. Even when the imperial capital was located at St. Petersburg (1713–1728, 1732–1917), Russian coronations were always held in Moscow at the Cathedral of the Dormition in the Kremlin. The last coronation service in Russia was held on 26 May 1896 for Nicholas II and his wife Alexandra Feodorovna, who would be the final Tsar and Tsaritsa of Russia. The Russian Imperial regalia survived the subsequent Russian Revolution and the Communist period, and are currently on exhibit in a museum at the Kremlin Armoury.
Title: Geography of Russia
Content:  Russia is one of the world's most urbanized countries, with roughly 75% of its total population living in urban areas. Moscow, the capital and largest city, has a population estimated at 12.4 million residents within the city limits, while over 17 million residents in the urban area, and over 20 million residents in the metropolitan area. Moscow is among the world's largest cities, being the most populous city entirely within Europe, the most populous urban area in Europe, the most populous metropolitan area in Europe, and also the largest city by land area on the European continent. Saint Petersburg, the cultural capital, is the second-largest city, with a population of roughly 5.4 million inhabitants. Other major urban areas are Yekaterinburg, Novosibirsk, Kazan, Nizhny Novgorod, and Chelyabinsk.
Title: Yekaterinburg
Content:  Yekaterinburg, alternatively romanized Ekaterinburg, formerly known as Sverdlovsk (Свердловск, 1924–1991), is the largest city and the administrative centre of Sverdlovsk Oblast and the Ural Federal District, Russia. The city is located on the Iset River between the Volga-Ural region and Siberia, with a population of roughly 1.5 million residents, up to 2.2 million residents in the urban agglomeration. Yekaterinburg is the fourth-largest city in Russia, the largest city in the Ural Federal District, and one of Russia's main cultural and industrial centres. Yekaterinburg has been dubbed the "Third capital of Russia", as it is ranked third by the size of 
Title: Russian Empire Census
Content: Saint-Petersburg – 1,264,900 ; Moscow – 1,038,600 ; Warsaw – 626,000 ; Odessa – 403,800 ; Łódź – 314,000 ; Riga – 282,200 ; Kiev – 247,700 ; Kharkiv – 174,000 ; Tbilisi (Tiflis) – 159,600 ; Vilna (Vilnius) – 154,500 ; Saratov – 137,100 ; Kazan – 130,000 ; Rostov-on-Don – 119,500 ; Tula – 114,700 ; Astrakhan – 112,900 ; Ekaterinoslav (Dnipro) – 112,800 ; Baku – 111,900 ; Kishinev (Chişinău) – 108,500 ; Helsinki – 93,000 ; Nikolayev – 92,000 ; Minsk – 90,900 ; Nizhny Novgorod – 90,100 ; Samara – 90,000 ; Orenburg – 72,400 ; Yaroslavl – 71,600 ; Dvinsk (Daugavpils) – 69,675 ; Vitebsk – 65,900 ; Reval (Tallinn) – 64 572 ; Libava (Liepāja) – 64,489 ; Yekaterinodar (Krasnodar) – 65,600 ; Tsaritsyn (Volgograd) – 55,200 Largest cities of the Empire according to the census: 
Title: Federal cities of Russia
Content:  A city of federal importance  or federal city in Russia is a city that has a status of both an inhabited locality and a constituent federal subject. There are three federal cities: Moscow, Saint Petersburg, and Sevastopol. Two of them are the largest cities in the country: Moscow is the national capital and Saint Petersburg is a previous Russian capital and important port city in the Baltic Sea. Sevastopol is the newest federal city, located in the disputed region of Crimea, which was annexed by the Russian Federation in 2014 but is recognised as Ukrainian territory by most of the international community. 
Title: Omsk
Content:  Omsk is the administrative center and largest city of Omsk Oblast, Russia. It is situated in southwestern Siberia, and has a population of over 1 million. Omsk is the second-largest city in Siberia after Novosibirsk, and is ninth-largest city in Russia. It is an essential transport node, serving as a train station for the Trans-Siberian Railway and as a staging post for the Irtysh River. During the Imperial era, Omsk was the seat of the Governor General of Western Siberia and, later, of the Governor General of the Steppes. For a brief period during the Russian Civil War in 1918–1920, it served as the capital of the anti-Bolshevik Russian State and held the imperial gold reserves. Omsk serves as the episcopal see of the bishop of Omsk and Tara, as well as the administrative seat of the Imam of Siberia. The mayor is Oksana Fadina.

Question: What is the capital of Russian Empire?
Answer: Saint Petersburg.
St. Petersburg.
Petrograd.
Leningrad.
Petersburg.
Sankt-Peterburg.
St Petersburg.