Giacomo della Porta
Italian architect who completed Michelangelo's dome and shaped Roman Baroque.
Giacomo della Porta (1533–1602) was an Italian architect and sculptor, likely born in Genoa or Porlezza. His style drew from Michelangelo and Giacomo Barozzi da Vignola. He began sculpting in his late twenties, later shifting to architecture. His first major architectural project in Rome was the Oratory of Santissimo Crocifisso. In 1564, he became Architect of the Roman People, overseeing notable public and private commissions. Della Porta often completed or added to works started by other architects rather than designing entirely original projects.
He was born into a family of sculptors in 1533. In 1559, he worked in his uncle Bartolomeo’s workshop, sculpting statues of the Cybo family for a chapel in Genoa Cathedral. Between 1560 and 1561, he built his first architectural work: the portal of the Vigna Grimani on the Quirinale.
Della Porta apprenticed under Guidetto Guidetti. His architecture blended Michelangelo’s Mannerism with Vignola’s Classicism, prioritizing functionality. From 1561 to 1568, he worked with Guidetti on the Oratory of Santissimo Crocifisso, where his style first matched his mentors’. After Guidetti and Michelangelo died in 1564, Della Porta finished their projects, including Guidetti’s Santa Caterina de' Funari and the Cesi Chapel, as well as Michelangelo’s plans for the Campidoglio and the Sforza Chapel.
In June 1561, Della Porta designed plans and a façade for the Oratory of Santissimo Crocifisso for the Confraternity of the Most Holy Crucifix. The façade showed a decorative, Michelangelo-inspired style, with pediments, triglyphs, garlands, and candelabra on the lower section, and ribbon-and-garland motifs above the windows. This project boosted his reputation and led to future commissions.
For Santa Caterina de' Funari, begun by Guidetti in 1560, Della Porta likely contributed to the façade. Similarities to his earlier work—such as ribbons, garlands, cartouches, an inscription, and a coat of arms—appeared on the façade, echoing the Oratorio di San Marcello.
As Architect of the Roman People from 1564, Della Porta oversaw Capitoline works. On the Capitoline Hill, he supervised Michelangelo’s designs, adding the Palazzo dei Conservatori façade (1586), the Palazzo Senatorio’s interior and façade, and the Cordonata. He designed the large window at Palazzo dei Conservatori, the windows and door surround at Palazzo Senatorio, and lower
- born
- 1533
- died
- 1602
- field
- Architect and sculptor
- nationality
- Italian
- known_for
- Completing Michelangelo's dome at St. Peter's Basilica; designing the façade of Il Gesù; serving as Architetto del Popolo Romano
Lore & Background
Giacomo della Porta was born into a family of sculptors in 1533 in Genoa or Porlezza, Italy. In 1559, he began working in his uncle Bartolomeo's workshop as a sculptor. Among his earliest works in Genoa were statues of the aristocratic Cybo family, located in a chapel within Genoa Cathedral. Between 1560 and 1561, he completed his first architectural work, the portal of the Vigna Grimani on the Quirinale. He studied as an architect apprentice under Guidetto Guidetti, and his architectural style, rooted in functionality, drew influence from Michelangelo's Mannerism and Giacomo Barozzi da Vignola's Classicism. His first major project occurred between 1561 and 1568, where he worked as an architect alongside Guidetti on the Oratory of Santissimo Crocifisso in Rome. Following the death of both Guidetti and Michelangelo in 1564, Della Porta carried out their projects, ensuring their legacies were not left unfinished.
Reader's Guide
Giacomo della Porta's significance lies in his role as a pivotal figure who bridged the Renaissance and Baroque periods in Rome. As Architetto del Popolo Romano from 1564, he oversaw many Capitoline works, both public and private. He completed Michelangelo's designs for the Campidoglio and the Sforza Chapel, and notably worked with Domenico Fontana on the dome of St. Peter's Basilica between 1588 and 1590, modifying the curvature to be steeper and inserting chains to hold transverse forces. His design for the façade of Il Gesù, chosen over Vignola's in 1571, highlighted verticality and produced a powerful central climax, setting the stage for later Baroque façades. Della Porta also completed a number of Rome's fountains, including those in Piazza del Popolo, the Fountain of Neptune, La Fontana del Moro, and Fontana delle Tartarughe. His tendency to carry out projects begun by other architects—such as the Palazzo Farnese, Villa Aldobrandini, and the Basilica of Santa Maria Maggiore—ensured the completion of many major Roman works. He died suddenly in 1602 returning to Rome from Frascati, where he was working on the Villa Aldobrandini.
Did You Know?
- Giacomo della Porta was most likely born in Genoa or Porlezza, Italy.
- He was elected Architetto del Popolo Romano in 1564.
- He worked with Domenico Fontana on Michelangelo's dome for St. Peter's Basilica, making it steeper and adding chains to hold transverse forces.
- His design for the façade of Il Gesù was chosen over Vignola's in 1571.
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