St. Peter’s Basilica completes mosaic restoration of ornate chapel dome

Ishmael Adibuah By Ishmael Adibuah for EWTN News

The Fabbrica di San Pietro restored several mosaics in the side chapel dome, a project that began in May 2025.

A mosaic depicting the coat of arms of Pope Clement VIII. It was one of the mosaics restored in the Clementine Chapel from May 2025 to September 2026. | Credit: Fabbrica di San Pietro
A mosaic depicting the coat of arms of Pope Clement VIII. It was one of the mosaics restored in the Clementine Chapel from May 2025 to September 2026. | Credit: Fabbrica di San Pietro

St. Peter’s Basilica, which is marking 400 years since its consecration, has completed a mosaic restoration in the dome of one of its most ornate chapels.

The Fabbrica di San Pietro — the Vatican institution responsible for maintaining St. Peter’s — announced the project’s completion on Sept. 17. The announcement described the project as necessary to conserve “one of the most significant decorative achievements of early seventeenth-century Rome.” The Italian Mannerist painter Cristofano Roncalli (also known as “Il Pomarancio”) created the mosaics between 1601 and 1604.

The circular hole contains the name of Pope Clement VIII, who commissioned the Clementine Chapel on the upper floor of St. Peter’s Basilica. The restoration of the dome’s mosaics was completed in September 2026. | Credit: Fabbrica di San Pietro
The circular hole contains the name of Pope Clement VIII, who commissioned the Clementine Chapel on the upper floor of St. Peter’s Basilica. The restoration of the dome’s mosaics was completed in September 2026. | Credit: Fabbrica di San Pietro

The Clementine Chapel, distinct from another of the same name in the Vatican Grottoes, contains the Altar of St. Gregory the Great (where he is buried), the monument to Pope Pius VII, the Altar of the Lie, and the Altar of the Transfiguration.

Deacons process through the Clementine Chapel in St. Peter’s Basilica during a chrism Mass with Pope Leo XIV on April 2, 2026. | Credit: Ishmael Adibuah/EWTN News
Deacons process through the Clementine Chapel in St. Peter’s Basilica during a chrism Mass with Pope Leo XIV on April 2, 2026. | Credit: Ishmael Adibuah/EWTN News

The restoration included preliminary inspections of the mosaics, cleaning and dust removal, removal of incompatible materials, and efflorescence treatment.

The Clementine Chapel was commissioned by Pope Clement VIII, who reigned from 1592–1605. It was begun and designed by the renowned Italian artist Michelangelo Buonarroti, who also designed the main dome of St. Peter’s Basilica. The Italian architect Giacomo della Porta completed the chapel’s dome in 1580, 20 years before the jubilee year of 1600.

An empty St. Peter’s Basilica. | Credit: Vatican Media
An empty St. Peter’s Basilica. | Credit: Vatican Media

The mosaics were restored as St. Peter’s Basilica marked the 400th anniversary of its consecration. In February, the Vatican announced that it will open new parts of the basilica — including the full terrace — and roll out a “SmartPass” digital entry system.

The basilica, which replaced an earlier Constantinian basilica, was consecrated by Pope Urban VIII on Nov. 18, 1626.

A view of St. Peter’s Basilica during the canonization Mass of St. Giovanni Battista Scalabrini and St. Artemide Zatti on Oct. 9, 2022. | Credit: Daniel Ibañez/EWTN News
A view of St. Peter’s Basilica during the canonization Mass of St. Giovanni Battista Scalabrini and St. Artemide Zatti on Oct. 9, 2022. | Credit: Daniel Ibañez/EWTN News

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