Santa Maria degli Angeli e dei Martiri (the basilica in the Piazza della Repubblica, formerly the Piazza dell'Esedra, at the termini of Via Nazionale in Rome, on the site of the Terme di Diocleziano (the Baths of Diocletian, the largest Roman public bath complex ever built, completed in 306 AD)): the church that Michelangelo Buonarroti, in his 87th and 88th years (1561-1563, the last years before his death in 1564), designed for Pope Pius IV as the radical architectural adaptation of the Roman frigidarium (the cold-water hall, the largest surviving room of the Diocletian Baths, with an interior volume of approximately 4,000 m³ and the original 28m-high vaulted ceiling) into a Christian basilica: the most ambitious single example of Roman imperial architecture converted to Christian use in any period after Constantine.
The specific Michelangelo intervention: the frigidarium-to-basilica transformation (Michelangelo's specific architectural decision (the counterintuitive choice to orient the new church transversely across the frigidarium rather than longitudinally, making the former bathing hall's short axis the new church's nave axis, the long axis the transept)): the result is a church whose "nave" is in fact the ancient Roman hall's transept, whose "transept" is a 100m-long hall that exceeds the dimensions of most Italian cathedral naves, and whose eight original Roman monolithic pink granite columns (10.64m high, approximately 1.56m in diameter, the largest surviving ancient Roman interior columns in use in any building in the world) remain in exactly their original positions, now framing the Christian altars instead of the Roman bathing spaces. Michelangelo's design was significantly modified by Luigi Vanvitelli in 1749 (the addition of the entrance vestibule in the former tepidarium, the reorientation of the main altar, and the Baroque decoration of the transept spaces), what the visitor sees today is the Michelangelo-Vanvitelli composite rather than the pure Michelangelo conception.
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Santa Maria degli Angeli: The Meridian, the Columns, and the Visit
The Meridian Line
Santa Maria degli Angeli meridian line (the specifically astronomical instrument on the church floor, the 45m bronze meridian line inlaid in the travertine pavement of the former Roman frigidarium hall, with the zodiac signs marked along its length): the meridian (the 1702 Francesco Bianchini design for Pope Clement XI, the specific gnomonic installation (the hole in the south transept wall at 20.34m height that admits a beam of sunlight at solar noon, the beam tracking along the meridian line through the year and reaching the specific zodiac markers at the specific solstice and equinox moments)): the meridian at Santa Maria degli Angeli was the primary official astronomical instrument for determining the exact date of Easter for the papal calendar until the 19th century, the specific technical function (the Easter calculation requires precise determination of the March equinox, which the meridian line can verify with higher accuracy than any mechanical clock of the period). The meridian line is visible in the church floor at all times. The specific midday sunbeam (the gnomonic effect) is visible in clear weather conditions at approximately 12:00-12:30 (varying slightly by season).
Santa Maria Degli Angeli E Dei Martiri: tours & tickets
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See availability & prices →Compare tours on Viator →We may earn a commission, at no extra cost to you.The Roman Columns
The eight original Roman granite columns (the Aswan red granite monolithic columns, quarried in Roman Egypt and transported to Rome for the Diocletian Baths): the specific column dimensions (10.64m height, 1.56m average diameter, approximately 100 tonnes per column, the largest Roman monolithic columns surviving in any interior space): Michelangelo's specific preservation decision (retaining the existing Roman columns in their original positions rather than removing or replacing them): the result is the most direct physical encounter with Roman imperial construction available in any functioning Roman building, the visitor stands among the same columns that the Roman bathers stood among in 306 AD, in the same vaulted space (the vault is the Roman original, though patched and restored), looking at the same ceiling that the emperor Diocletian commissioned. Open daily 7:30-19:30. Free.
Q&A: Santa Maria degli Angeli Rome
Is Santa Maria degli Angeli better than the other Diocletian Baths museums?
Different experience: the Museo Nazionale Romano alle Terme di Diocleziano (the national museum in the adjacent Diocletian Baths complex, the epigraphic collection and the Roman artifacts in the original bath rooms) provides the most archaeologically complete Diocletian Baths experience. Santa Maria degli Angeli provides the most spatially immediate (the visitor is inside a functioning room of the baths, not a museum of artifacts from the baths). For the visitor interested in Roman architecture: the Santa Maria degli Angeli church is the most important surviving Diocletian Baths space because it is the only room where the original Roman volume (the 28m vault, the 28m-wide span, the original columns) is intact and experienceable in its original dimensions, the museum spaces are smaller rooms whose artifacts are important but whose architecture is less monumental.
Internal Links
- Terme di Diocleziano: Il Più Grande Bagno Romano
- Michelangelo Roma: Le Terme e la Basilica
- Fotografare Santa Maria degli Angeli: I Colori Romani
- Santa Maria degli Angeli: Ingresso Gratuito
- Piazza della Repubblica in Inverno: La Basilica
- Roma Nascosta: La Meridiana della Repubblica
- Vanvitelli Roma: Il Completamento Settecentesco
