Above the main entrance is the inscription (translated from Latin), "In honor of the prince of apostles; by Paul V Borghese, a Roman, Supreme Pontiff, in the year 1612 and the seventh year of his pontificate."
from the New World Encyclopedia website
I know that there is latin and greek text of some sort that goes around the entire interior body of the church, but the only text that I do know is the ones up inside the dome, above the altar.
Around the inside of the dome is written, in letters 2 metres (6.6 ft) high:
TV ES PETRVS ET SVPER HANC PETRAM AEDIFICABO ECCLESIAM MEAM. TIBI DABO CLAVES REGNI CAELORVM
("...you are Peter, and on this rock I will build my church. ... I will give you the keys of the kingdom of heaven..." Vulgate, Matthew 16:18-19.)
Beneath the lantern (on the topmost part of the inside of the dome says):
S. PETRI GLORIAE SIXTVS PP. V. A. M. D. XC. PONTIF. V.
(To the glory of St Peter; Sixtus V, pope, in the year 1590 and the fifth year of his pontificate.)
This inscription is telling us when the dome itself was built and designed by the artist Michelangelo, while the other on the bottom part of the dome (placed hundreds of stories above the tomb of saint peter, below the vatican catacombs) is telling us a passage form The Bible where as Jesus hands unto St. Peter the responsibility of keeping the Church together as the first pope as well as giving him the keys to the kingdom of heaven.
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No, it is not a requirement.
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