[2] A "live" bridge of boats linked the Kremlin with Zamoskvorechye on a nearby site as early as the 15th century.
In 1643, Tsar Mikhail Feodorovich engaged Anie and Jogann Cristler, architects from Strassburg to design a stone bridge.
Its south end terminated with a barbican tower, commonly called Six Gates (two for through traffic, four looking sideways).
[citation needed] The bridge deck originally included wooden storehouses, mills, taverns and tax collector's booths.
[4] The Second Stone Bridge was built in 1859 by colonel Tannenberg on the same site, in line with today's Lenivka Street.
Kalmykov's design was completed in 1935-1938, on a site which is two blocks closer to Kremlin than the previous bridges.