His masterpiece remains the church and façade of San Gaetano (built 1604–1648) in front of Piazza Antinori in Florence. The work was commissioned by the Cardinal Carlo de Medici, and dedicated to the founder of the Theatine order. The building work was shared with Matteo Nigetti. The church is also known as the Church of San Michele and San Gaetano, because it was built on the site of a Romanesque church of San Michele Bertelde. The façade with its sculptural decorations is highly atypical for Florentine churches, which had a predilection for iconoclastic geometrically ornamented façades.