Fire of Moscow
The first of the boulevards, Tverskoy Boulevard, emerged in 1796, but the ring was completely developed in 1820s, after the disastrous 1812 fire. The Ring replaced the medieval walls of the White City in the 1820s. The wall itself was razed in 1760, and despite the royal decrees to keep the site clear, the area was soon built over with private and state property. The Fire of Moscow destroyed many of those buildings, allowing the city planners to replace them with wide green boulevards.