Santa Maria degli Angeli e dei Martiri

The Basilica of St. Mary of the Angels and of the Martyrs ( la, Beatissimae Virginis et omnium Angelorum et Martyrum, it, Santa Maria degli Angeli e dei Martiri) is a basilica and titular church in Rome, Italy, built inside the ruined ''frigidarium'' of the Roman Baths of Diocletian in the Piazza della Repubblica.

It was constructed in the 16th century following an original design by Michelangelo Buonarroti. Other architects and artists added to the church over the following centuries. During the Kingdom of Italy, the church was used for religious state functions.

Description

The basilica is dedicated to the Christian martyrs, known and unknown. By a brief dated 27 July 1561, Pius IV ordered the church "built", to be dedicated to the ''Beatissimae Virgini et omnium Angelorum et Martyrum'' ("the Most Blessed Virgin of all the Angels and Martyrs"). Impetus for this dedication had been generated by the account of a purported vision of experienced in 1541 at Santa Maria di Loreto, Rome of the ruins of the Baths by a Sicilian monk, Antonio del Duca, who had been lobbying for decades for papal authorization of a more formal veneration of the Angels."The Basilica", S. Maria degli Angeli e dei Martiri
/ref> It was also a personal monument of Pope Pius IV, whose tomb is in the apsidal tribune.

The ''thermae'' of Diocletian dominated the Viminal Hill with their ruined mass. Michelangelo Buonarroti worked from 1563 to 1564 to adapt a section of the remaining structure of the baths to enclose a church. Upon Michelangelo's death in 1564, the work was carried on by his pupil, Jacopo Del Duca. Some later construction was directed by Luigi Vanvitelli in 1749. In 1911, the Vanvitellian façade on Piazza Esedra was demolished to restore the suggestive niche of the calidarium with Roman bricks. This intervention, however, made the church less visible, and often mistaken for a ruin."Basilica di Santa Maria degli Angeli e dei Martiri", Turismo Roma, Dipartimento Grandi Eventi, Sport, Turismo e Moda
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At Santa Maria degli Angeli, Michelangelo achieved a sequence of shaped architectural spaces, developed from a Greek cross, with a dominant transept, with cubical chapels at each end, and the effect of a transverse nave. There is no true facade; the simple entrance, with its unique concave brick shape, is one of the ancient exedras of the calidarium of the ''thermae''.

The great vaulted transept emphasized the scale of the Roman constructions, 90.8 meters long, and with the floor that Michelangelo raised to bring it up to the 16th century street level, 28 meters high. Raising the floor truncated the red granite Roman columns that articulate the transept and its flanking spaces. Michelangelo made the transept 27 meters wide, thus providing vast cubical spaces at each end of the transept.

The vestibule with canted corners and identical side chapels—one chapel has the tomb of Salvator Rosa, the other of Carlo Maratta—leads to a second vestibule, repeated on the far side of the transept, dominated by the over lifesize ''Saint Bruno of Cologne'' by Jean Antoine Houdon (1766). Of the ''Saint Bruno'', Pope Clement XIV said that he would speak, were it not for the vow of silence of the order he founded. The Carthusian monks held both the Church and the monastery from 1581 to 1873. The monastery is now a museum.

The Chapel of San Bruno houses the organ of Formentelli from the Millenium Jubilee. Made by the organ builder Bartolomeo Formentelli from Verona, it was a gift to Pope John Paul II from the city of Rome.

In 2006, Polish-born sculptor Igor Mitoraj created new bronze doors as well as a statue of John the Baptist for the basilica. In April 2010, a five-metre-high () bronze statue of Galileo Galilei Divine Man (designed by 1957 Nobel laureate Tsung-Dao Lee) was unveiled in a courtyard within the complex. The statue (a dedication to the 17th-century scientist and philosopher) was a donation from CCAST ( China Center of Advanced Science and Technology) and WFS (World Federation of Scientists).

Santa Maria degli Angeli was the official state church of the Kingdom of Italy (1870–1946). More recently, national burials have been held in the church. The church hosts the tombs of General Armando Diaz and Admiral Paolo Thaon di Revel, who were successful commanders during World War I on the Italian front. Also today the Basilica is used for many ceremonies, including the funeral of soldiers killed abroad.

The meridian line

At the beginning of the 18th century, Pope Clement XI commissioned the astronomer, mathematician, archaeologist, historian and philosopher Francesco Bianchini to build a meridian line, a sort of sundial, within the basilica. Completed in 1702, the object had a threefold purpose: the pope wanted to check the accuracy of the Gregorian reformation of the calendar, to produce a tool to predict Easter exactly, and, not least, to give Rome a meridian line as important as the one Giovanni Domenico Cassini had recently built in Bologna's basilica of San Petronio, San Petronio. Alan Cook remarked, "The disposition, the stability and the precision are much better than those of the famous meridian... in Bologna".

This church was chosen for several reasons: (1) Like other baths in Rome, the building was already naturally southerly oriented, so as to receive unobstructed exposure to the sun; (2) the height of the walls allowed for a long line to measure the sun's progress through the year more precisely; (3) the ancient walls had long since stopped settling into the ground, ensuring that carefully calibrated observational instruments set in them would not move out of place; and (4) because it was set in the former baths of Diocletian, it would symbolically represent a victory of the Christian calendar over the earlier pagan calendar.

Bianchini's sundial was built along the meridian that crosses Rome, at longitude 12° 30' E. At solar noon, which varies according to the equation of time from around 10:54 a.m. UTC in late October to 11.24 a.m. UTC in February (11:54 to 12:24 CET), the sun shines through a small hole in the wall to cast its light on this line each day. At the summer solstice, the sun appears highest, and its ray hits the meridian line at the point closest to the wall. At the winter solstice, the ray crosses the line at the point furthest from the wall. At either equinox, the sun touches the line between these two extremes. The longer the meridian line, the more accurately the observer can calculate the length of the year. The meridian line built here is 45 meters long and is composed of bronze, enclosed in yellow-white marble.

In addition to using the line to measure the sun's meridian crossing, Bianchini also used the window behind the pope's coat of arms and a movable telescope to observe the passage of several stars such as Arcturus and Sirius to determine their right ascensions and declinations. The meridian line was restored in 2002 for the tricentenary of its construction, and it is still operational today.

Cardinal Protectors since 1687

The Church of S. Maria degli Angeli was designated a titular church for a cardinal priest on 15 May 1565 by Pope Pius IV. Since 1687,For the period 1565–1592, see Guilelmus van Gulik and Conradus Eubel, ''Hierarchia catholica medii et recentioris aevi'' Volumen III (Monasterii 1923), p. 65. For the period 1593–1687, see Patricius Gauchat, ''Hierarchia catholica medii et recentioris aevi'' Volumen IV (Monasterii 1935), p. 45. the following prelates have served as cardinal protector of Santa Maria degli Angeli e dei Martiri:

* Sigismondo Pappacoda (December 1527 – November 1536)
* Giovanni Antonio Serbelloni (15 May 1565 – 12 April 1570)
* Prospero Santacroce (12 April 1570 – 5 May 1575
* Giovanni Francesco Commendone (5 July 1574 – 9 January 1584)
* Mark Sittich von Hohenems (3 October 1577 – 3 October 1578)
* Simeone Tagliavia d'Aragona (20 May 1585 – 9 December 1592)
* Federico Borromeo (25 October 1593 – 21 September 1631)
* Ernst Adalbert von Harrach (7 June 1632 – 18 July 1667
* Marzio Ginetti (17 October 1644 – 19 February 1646)
* Niccolo Albergati-Ludovisi (25 June 1646 – 11 October 1666)
* Antonio Bichi

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