Edited

Everybody has known since ancient times, china is the dragon. Even when the Dead Sea Scrolls and Septuagent were written.

Four allegedly definitive sources are usually given. Whats yours beej? seventh day adventist?

A Protestant woman visiting Rome claimed she witnessed Pope Gregory XVI wearing a crown with the words on it, in or around 1832;
Pope Gregory XVI had supposedly worn a papal tiara with these words clearly visible on it at a Pontifical High Mass during Easter 1845;
The 'existence' of a photograph of a papal funeral at the start of the twentieth century (which probably means the funeral of Pope Leo XIII in 1903 but could possibly be Pope Pius X's in 1914) showing the words on a papal tiara.
The tiara (with the words mentioned) is always used to crown popes, but specifically was used in 1939 to crown Eugenio Pacelli as Pope Pius XII

The reality
The claim is false.
Whether or not the numerised total of the letters in Vicarius Filii Dei produce the total '666' is irrelevant because no such title actually exists for the papacy or the Holy See. While the words did feature in the Donation of Constantine (a forged document) they referred to St. Peter not subsequent popes. Current popes are known to use the title Vicarius Christi - representative of Christ.

In 1832, only three known tiaras existed; one from the eighteenth century, an 1800 papier-mâché tiara and one given by Napoleon I to Pope Pius VII in 1804. None of them seemed to contain writing.
No pope has ever worn the 1804 tiara. It was deliberately designed on Napoleon's orders to be too small to fit on a head and too heavy to wear. Popes also refused to wear it on principle because it was made up from parts of older tiaras broken up and stolen from the Vatican in 1798.

Pope Gregory could not have worn a triple tiara containing the alleged words during Easter Mass in 1845, because, as has been mentioned, papal tiaras were never worn during religious ceremonial, and most especially not during Mass. (The only principal exception, when a pope gave his traditional urbi et orbi blessing wearing the Tiara, occurred high up on a balcony and could not possibly be confused with a Mass celebrated at an altar.)

By 1845 the pope had received a new tiara, which like the earlier two does not seem to contain any writing. Only one tiara has any major writing at all, the Belgian tiara of 1871 but it does not appear to feature Vicarius Filii Dei or words even remotely similar. It reads Christi Vicario in Terra Regum, with the words spread out over three layers. Only one word of the alleged writing appears in the actual words on the 1871 tiara, and even there the word is in a different grammatical case.

For pictures of popes wearing these tiaras, seethis link http://en.wikipedia.org/wiki/Papal_Tiara

All of the tiaras in existence at the time of the creation of photography and hence in the timeframe for the mysterious 'photographic evidence' still exist and seem to have been accounted for, through receipts, repair records, valuations, etc. No tiara other than those currently in existence seemed to have existed since the destruction of early Tiaras by Napoleon's soldiers at the beginning of nineteenth century.

Though the evidence supposedly 'exists' in the form of a photograph, in nearly one hundred years no-one has been able to produce the photograph, or even give definitive evidence of its existence, such as stating where exactly it was published.

While 'promoters' of the story constantly demand that the tiaras be 'released so that they can be inspected', that has supposedly been happening. One tiara is on public display in St. Peter's basilica itself on June 29th every year, where it is placed on the head of a statue of St. Peter. Pope Paul VI's tiara is on permanent display in Washington, DC. All the other tiaras appear to have been displayed either separately or in groups, not just within the Vatican but even in the United States, where the 'story' first originated. They have also been displayed around Europe. Having been seen by large numbers, no-one appears to have seen the words Vicarius Filii Dei on the side of a papal tiara, as is the claim.

There is not one Papal Tiara but many, with numerous ones being used for different popes, often with the decision on which one to use being decided on the basis of which one corresponded most closely to papal head size. Yet some websites promoting the myth speak of the same tiara always being used.

The papal tiara used in the coronation of Pope Pius XII, which was explicitly stated in one website as being the tiara with the Vicarius Filii Dei words spelt out in jewellery and diamonds was in fact manufactured in 1877 and so could not have been the tiara with those words supposedly seen in 1832 or 1845. As Pope Pius XII's coronation was filmed and shown in cinemas around the world, had his papal tiara contained such words, they would have been captured by the camera and seen by millions worldwide in theatres. Even if the actual placing of the crown on Pius's head was not seen clearly from a distance by film cameras, photographers were allowed access, being able to photograph the coronation from within a few feet of the Supreme Pontiff. Pius as a result was pictured from different angles up close. If lettering existed on Pius's exterior crown, it could not but have been seen and pictured.
Wanna see this one too? http://www.royal-magazin.de/collection/tiara-papst.htm

In the absence of any hard evidence of Vicarius Filii Dei on any papal crown, it has been suggested that it exists on a papal mitre. Again the words do not seem to appear on any of the vast number of known mitres in existence in the Vatican. Furthermore, references have been made to a "triple tiered mitre". Mitres are not known for fact to have been triple tiered. Only the papal crown was triple tiered.

Even if, contrary to all the known evidence a triple tiara with those words on it did exist and had been photographed (presumably placed on the coffin of the late pope), in the absence of modern photographic technology or even zoom lens, with constant movement during the funeral ceremony and slow shutter speeds, the chances a camera being able from a distance (and given the restrictions imposed on photographers during a papal funeral, it would have to have been at a distance) to capture lettering on a tiara are remote in the extreme. (One of the websites 'claiming' such a photograph exists shows a photograph of a papal tiara placed on top of the glass-sided coffin of Pius X at his canonisation. Even in the 1950s when that picture was taken, the photographic technology was such that neither the pope's remains nor the tiara could be clearly seen.

The story seems to owe its modern origins to a written story in an American Roman Catholic magazine, Our Catholic Visitor of 15 November 1914, in which the author referred to the mythical title. Others inside and outside Catholicism repeated the claim as fact, based on the article. The article was subsequently changed twice in issues of the magazine published in September 1917 and August 1941. Historically, where this story first developed remains unclear. It did however spread, being accepted as 'fact' by both Catholics and non-Catholics alike (though with each side attaching different meanings to it). Some historians, academics and religious leaders view the story as a classic anti-Catholic urban myth, a story for which not the slightest shred of evidence has been found.

The Seventh-day Adventist Church all but abandoned the search for the 'evidence' after years of searching. However, some groups within the church still hold on to the belief that such a tiara with such a title existed. The search was resurrected when a member of the Church managed to get access to the original Our Catholic Visitor article, the article itself being treated as evidence that efforts of the Roman Catholic Church to 'suppress' the truth had failed. Though no other evidence apart from one article in one magazine in 1914 (which subsequently stated twice that it had got its facts wrong) has ever been produced, some groups, both within and outside of the Seventh-day Adventist Church, continue trying to prove both existence of such a papal title and of a tiara bearing the title. It is claimed that all popes are crowned with the tiara with the words Vicarius Filii Dei on it. When a Roman Catholic Church denial was issued, it was suggested that the words might have appeared on some mitre rather than a crown, or on some crown deliberately hidden from view.

Additional claims have been made that the words Vicarius Filii Dei exist in Church documents, including supposedly in a book by Pope John Paul II. However every "quote" produced from the book has supposedly proven to be a mistranslation of the original text.

beej, your basis of claim that Vicarius Filii Dei, when numerised, produces the total of 666. It is based on the roman numeral value of certain letters.

V – 5
I – 1
C – 100
A
R
I – 1
U – 5 (note that the Romans rendered U as V)
S

F
I – 1
L – 50
I – 1
I – 1

D – 500
E
I – 1

TOTAL – 666

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