What work did Francesco Borromini do at St. Peter’s Basilica early in his career?

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Rome: Piazza Navona — Francesco Borromini Piazza Navona, Rome, with the church of Sant'Agnese in Agone, designed by Francesco Borromini, and (foreground) the Fountain of the Moor, originally designed by Giacomo della Porta and revised by Gian Lorenzo Bernini.

Early in his career, Francesco Borromini worked at St. Peter’s Basilica under his kinsman, the architect Carlo Maderno, with whom he collaborated on various architectural problems.1

Following Maderno’s death, Borromini continued his work at the basilica in close cooperation with Gian Lorenzo Bernini. Their most significant joint project was the design and realization of the monumental bronze baldachin raised over the tomb of St. Peter. Borromini’s contribution to this structure, particularly the large S-shaped volutes crowning the four corkscrew columns, was considered highly important, and he was paid a substantial sum for his work between 1631 and 1633.1