Three square gates existed on the eastern side of the Kremlin wall, which in the 17th century, were known as Konstantino-Eleninsky, Spassky, Nikolsky (owing their names to the icons of Constantine and Helen, the Saviour and St. Nicholas that hung over them). The last two were directly opposite the Red Square, while the Konstantino-Elenensky gate was located behind Saint Basil's Cathedral.