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.
Treaty of Saint Petersburg (1805)
The Treaty of Saint Petersburg was signed on 11 April 1805 by the British Empire and the Russian Empire and created an offensive alliance directed against Napoleon's French Empire.