The church was designed by Giacomo della Porta .
The church was built by Domenico Fontana between 1518 and 1589 , and completed through the personal intervention of Catherine de ' Medici , who donated to it some property in the area .
The church was designed by Giacomo della Porta and built by Domenico Fontana between 1518 and 1589 , and completed through the personal intervention of Catherine de ' Medici , who donated to it some property in the area .