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Italy, Rome, St. Peter's Basilica | Inscriptions
Professor Dale Kinney

Buildings often document their own origins, and sometimes their intentions, with inscriptions. St. Peter's had at least three: two lines in niello (black enamel) incised in a large gold cross that stood or hung over St. Peter's tomb; two lines on the triumphal arch (that is, the arch opening into the transept) recorded in the 15th century; and four lines in the apse, recorded by a Carolingain monk around 800. The inscriptions read:

1. (on the cross) EMPEROR CONSTANTINE AND EMPRESS HELENA / THE HALL SURROUNDS THIS REGAL HOUSE GLEAMING WITH LIKE SPLENDOR.

(Constantinus Augustus et Helena Augusta/hanc domum regalem simili fulgore corruscans aula circumdat.)

Helena, mother of Constantine, was proclaimed empress ("augusta") in 324 or 325, and died around 328. This inscription must have been made in those four years, and it is evidence that at least the transept was already built by then. Helena had a particular association with the relic of the cross, and it is tempting to relate this association to St. Peter's cruciform shape.

2. (on the triumphal arch) BECAUSE WITH YOU AS LEADER, THE WORLD TRIUMPHANT AROSE TO THE STARS / VICTORIOUS CONSTANTINE DEDICATED THIS HALL TO YOU.

(Quod duce te mundus surrexit in astra triumphans/hanc Constantinus victor tibi condidit aulam.)

The "you" of this inscription must be Christ; it indicates that the church was dedicated to him rather than to St. Peter, credits the foundation of the "hall" (the transept? the nave? the whole basilica?) to Constantine, and implies some association with a (military?) victory.

3. (on the apse wall) SEAT OF JUSTICE, HOUSE OF FAITH, HALL OF MODESTY / THIS WHAT YOU SEE, WHICH ALL PIETY POSSESSES / WHICH REJOICES, RENOWNED, IN THE VIRTUES OF THE FATHER AND THE SON / AND EQUALS ITS AUTHOR IN THE PRAISES OF HIS PARENT.

(Iustitiae sedis fidei domus aula pudoris/haec est quam cernis pietas quam possidet omnis/quae patris et fili virtutibus inclyta gaudet/auctoremque suum genitoris laudibus aequat.)

There has been much discussion over the identity of the father, the son, and the "author" in this inscription. Some have argued that the father is Constantine and the son Constantius II (reigned 337–361); the inscription would thus indicate that the building begun by Constantine was finished (decorated?) by his heir. Others interpret these terms as references to Jesus and God the Father; in that case the "parent" of the author [of the building] might also be God, thus a spiritual parent. Krautheimer believed that the inscription referred to the installation of a mosaic in the apse by Constantius II between 352 and 361.


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