Born into a family of Russian Orthodox priests, Sergei Bulgakov, had grown distant from theology in his youth and studied law and political economy instead. Though he experimented with Marxism, he later moved back to the Church and formed what is now known as sophiology.
Russian theologian Pavel Florensky is best remembered for his essay The Pillar and the Ground of Truth. During Stalin’s regime and amid a phase of national atheism, he was sent to jail and also banished to Siberia for his religious beliefs, which he refused to renounce.
Aleksey Stepanovich Khomyakov was a Russian philosopher, theologian, poet, and amateur artist. Apart from co-founding an intellectual movement called the Slavophile movement, Khomyakov went on to serve as one of the most distinguished theoreticians of the movement.