What fortified center of Moscow was constructed during the reign of Ivan the Great?

The Kremlin is the fortified center of Moscow that was constructed during the reign of Ivan the Great, specifically in the late 15th century. Ivan III, also known as Ivan the Great, played a crucial role in the expansion of Moscow's influence and power, and he initiated the construction of the Kremlin as a symbol of Russian sovereignty and strength. The original structures were primarily made of wood, but they were later replaced with stone walls, turning the Kremlin into a formidable fortress.

The Kremlin has since become a significant political and historical site, housing important government buildings and serving as the official residence of the Russian President. Its architectural features and historical importance reflect the central role it played in the development of Moscow as the heart of Russia.

In contrast, Red Square, although significant for its proximity to the Kremlin and historical events, was not constructed during the reign of Ivan the Great, and neither was Saint Basil's Cathedral, which was commissioned later by Ivan the Terrible. The Winter Palace, located in St. Petersburg, was a tsarist residence established under a different period and context, well after the construction of the Kremlin. Therefore, the construction of the Kremlin is distinctly identified with Ivan the Great and serves as a vital part of Russian history.