Pyotr Chaadayev

Pyotr Yakovlevich Chaadayev (Russian: Пётр Я́ковлевич Чаада́ев; 7 June [27 May O.S.] 1794 – 26 April [14 April O.S.] 1856) was a Russian philosopher. He was one of the Russian Schellingians.