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The church of San Carlo alle Quattro Fontane (Saint Charles of the Four Fountains), also known as San Carlino because of its small size, was Borromini's first major solo work, which he considered an emblem of his own, so much so that he decided to change his real surname, Castelli, to Borromini in honour of the church's patron saint: Saint Charles Borromeo. Francesco Borromini (1599-1667). San Carlo alle Quattro Fontane was built in three phases. Firstly, the cloister and the conventual outbuildings, designed in 1634 and completed in 1644; secondly, the church, begun in 1638 and consecrated in 1646; and thirdly, the façade of the temple, begun in 1664. San Carlino opened up enormous creative and scenographic possibilities in building design. Its undulating lines, dynamic tension and contrasts of light and shadow had a profound influence on Baroque architecture. Many architects of the time travelled to Rome with the main aim of studying this church in detail, to draw it and to take note of its typology and its construction elements, as it was considered, at the time, to be the pinnacle of the Baroque spirit.