Moscow's Kremlin was the old seat of government in Russia. It became the heart of government again in the twentieth century, under the Bolsheviks. The word kremlin means fortified complex; they are found at the heart of all historic Russian cities. In Moscow's case, the huge kremlin is a fortified city-within-a-city containing palaces, churches, and armories. The Kremlin Square is also known as Cathedral Square. As it lay at the heart of the Kremlin, it was considered the symbolic heart of Moscow, and therefore of Russia itself.