Pyotr Grigoryevich Demidov (1807–1862)
He was the second child of Grigory Alexandrovich Demidov and his wife Ekaterina Petrovna Lopuchina, daughter of Pyotr Lopukhin and sister of Anna Lopukhina.
He joined the army in 1825 as a non-commissioned officer in a cavalry regiment.
On 14 July that year he was promoted to cornet and for his part in suppressing the November Uprising to lieutenant.
On 3 April 1849 he became major general and on 8 September 1855 adjutant general – at the latter rank he accompanied Alexander II of Russia to Moscow for his coronation.
On 12 July 1835 he married Elizaveta Hikolaevna Bezobrazova (1813–22 May 1876), by whom he had three children:
