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The decision to rebuild of the church was taken in 1652 as part of Pope Innocent X’s project to enhance the Piazza Navona, the urban space onto which his family palace, the Palazzo Pamphili, faced. The first plans for a Greek Cross church were drawn up by Girolamo Rainaldi and his son Carlo Rainaldi, who relocated the main entrance from the Via di Santa Maria dell'Anima to the Piazza Navona. The foundations were laid and much of the lower level walls had been constructed when the Rainaldis were dismissed due to criticisms of the design and Borromini was appointed in their stead.