Saint Petersburg (Russian: Санкт-Петербу́рг, tr. Sankt-Peterburg; IPA: [ˈsankt pʲɪtʲɪrˈburk]) is the second largest city in Russia. It is politically incorporated as a federal subject (a federal city). It is located on the Neva River at the head of the Gulf of Finland on the Baltic Sea. In 1914 the name of the city was changed from Saint Petersburg to Petrograd (Russian: Петрогра́д; IPA: [pʲɪtrɐˈgrat]), in 1924 to Leningrad (Russian: Ленингра́д; IPA: [lʲɪnʲɪnˈgrat]), and in 1991, back to Saint Petersburg. In Russian literature, informal documents, and discourse, the word "Saint" is usually omitted, leaving "Petersburg". In casual conversation Russians may drop the "burg" as well, referring to it as "Peter": Russian: Питер (Piter).
Tsar Peter the Great founded Saint Petersburg on May 27 [O.S. 16] 1703. Between 1713–1728 and 1732–1918 Saint Petersburg functioned as the imperial capital of Russia. In 1918 the central government bodies moved from Saint Petersburg (then named Petrograd) to Moscow. It is Russia's second-largest city after Moscow, with 5 million inhabitants (2012), and the fourth most populated federal subject. Saint Petersburg is a major European cultural center, and also an important Russian port on the Baltic Sea.