The history of the Pokrovsky Cathedral is taught in Russian schools. It was erected in 1555-1561 by the order of Tsar Ivan the Terrible to commemorate the victory of Russian troops over the Kazan Khanate and the capture of Kazan. There is still no clarity as to the "copyright" since there are three theories of its creators. According to one of them, the most likely, it was created by a famous Russian architect from Pskov, Postnik Yakovlev, nicknamed Barma. According to another theory, Barma and Postnik are not one person but two different architects who worked together to build the Cathedral. According to the third theory not confirmed by any documentary sources, the cathedral was built by an unknown Italian architect.
In addition to the many legends, there is some interesting evidence on the architectural features of the Cathedral. Everything - from the number of caps to their location in relation to each other - has a special Christian symbolism. The cathedral is an architectural image of the biblical New Jerusalem - the Kingdom of God described in Revelation. The cathedral consists of eight churches, organized around the ninth towering over them pillar-like church in honor of the Protection of the Mother of God. The number "eight" represents the day of Christ's resurrection, which in Hebrew calendar was the eighth day, and the coming kingdom of heaven - the kingdom of "Eighth Century" (or "Eighth Kingdom"), which comes after the Second Coming of Christ, after the end of the earth's history related to apocalyptic number "seven". In the old St. Basil Cathedral there were 25 domes designating the Lord, and 24 elders sitting around His throne. Currently there are only ten.