Nicholas I , July 6 (June 25, Old Style), 1796-March 2 (18 February Old Style), 1855), was the Emperor of Russia from 1825 until 1855, known as one of the most reactionary of the Russian monarchs. He was born in Gatchina to Emperor Paul I and Empress Maria Feodorovna. He was a younger brother to Alexander I of Russia and Grand Duke Constantine Pavlovich of Russia. Wikipedia
The definitive Wikipedia entry for Nicholas I of Russia. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Nicholas_I_of_Russia