History of Saint Petersburg
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.
Saint Petersburg Mathematical Society
The St. Petersburg Mathematical Society was founded in 1890 and was the third founded mathematical society in Russia after the Moscow (1867) and the Khar'kov (1879) ones. Its founder and first president was Vasily Imshenetskii, who also had founded earlier the Khar'kov Mathematical Society.