The St. Alexander was built in the first half of the 19th century in honor of Tsar Alexander I. The design by Christian Peter Aigner was inspired by the Greek Pantheon. In the eighties of the nineteenth century the church was enlarged and rebuilt, using neo-Renaissance elements and adding to its eclectic character. It was not until the reconstruction of the temple after the destruction of the Second World War that it restored its original appearance.
Some Poles believed that, with Alexander I taking over, Poland would regain at least partial autonomy. At the site of the temple was originally to stand a brick triumphal arch in his honor in connection with his arrival in Warsaw. Car did not agree to the proposed construction, suggesting instead to put in the center of the Three Crosses Square Catholic church.