Spasskaya Tower was built in 1491 during the reign of Ivan III architect Pietro Antonio Solari, as evidenced by the white stone slabs with commemorative inscriptions that are installed above the entrance gate of the tower. The outside of the tower inscription is in Latin; the inside - in Russian: "In the summer 6999 [1491] July by God's grace made there was this loophole command Ivan the Tsar and autocrat of all Russia and Grand Duke Volodimirskaya and Moscow and Novgorod and Pskov and Tver and Ugra and Vyatka and Perm and Bulgarian and other in 30 States, his summer, as did Peter Anthony Solari from the city of Mediolanum" (Milan). Before the construction of the existing tower on this spot stood the Frolovskaya Barbican white-stone Kremlin 1367. When repairing the Barbican in 1464-1466, D. V. Yermolin mounted on her white stone reliefs depicting the patrons of the Moscow princes - saints George and Demetrios; these reliefs was moved to the new tower, where they remained until the seventeenth century