history - A good puzzle is a double-edged sword

A rare double-edged sword is currently on loan from the British Museum to the Magna Carta exhibition.

The sword itself is described as likely made in Germany around 1250-1330 and includes the inscription pictured below.

So what does +NDXOXCHWDRGHDXORVI+ actually mean?

Answer

Section One

I started by researching futhark, Germanic/Teutonic, Anglo-saxon runes. I don't interpret the characters too tightly as "modern" letters. (Note: These are stylised characters, bull past the flair to "see" them.)

The crosses ARE Greek as suggested by a few commentators in the article linked to in OP. I don't see how the crossbars at the tips could make it mistakeable for a maltese cross, which debunks the argument for an Islamic origin. My reasoning being the level of craft involved in the rest of the inscription suggests that had the artisan intended to inscribe a maltese cross, he would have done so properly.

Another commentator high-signing PhD cred suggests the crosses in opening and closing to be the wrapper on the benediction, In nomine Patris et Filii et Spiritus Sancti, Amen, which would make them characters as well.

If I'm on the right track the first few characters seem to be more like HDGOG, I might be off on the O, I think the tenth character may be a U. The mystery character R #11 may be a "lowercase" N, which would make sense in that the name/title of Christ is still subordinate to the name God.

Now, runes are also still believed to possess magic properties, it's likely that this inscription may be a name for the blade, a prayer, or a "spell". Runes, besides being the regular writing of the people/tribes who regularly used them, were also viewed as mystical/magical by those from other tribes/groups. So I think that's a good place to start.

Beowulf would be a good primer, Beware Grendel....

Note: Runes [many] also represent individual words, Gothic runes.

It's thought that a mixed cipher kind of thing might be going on here between the meaning of individual characters and some peppering with Latin maybe?

There is some suggestion the X character is a separator, otherwise the first letter of the name/title of Christ. X = C

Now, here is my first bit of guessing based on the rune theory, the first two letters from the Gothic Rune chart (linked above)

N "naudiz" or "nyd" or "nauor" can mean roughly need, constraint, duress, trouble

D "dagaz" or "daeg" means day

Going back to the suggestion of the cipher/Latin peppering-

N irae $\rightarrow$ ire, anger, wrath, trouble

D dies $\rightarrow$ day

dies irae $\rightarrow$ day of wrath.

This is not the craziest theory, but we are talking about a sword here. An incantation/inscription evoking the spirit/magic of death is not unreasonable. Those are rough translations of what those characters actually mean in runic context.

See this page for a listing of "known" translations of similar inscriptions.

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Section 2:

This section will be for manipulations of the "translations".

Word of the Dei... xD , sorry, [H]omoousios homoousios (Greek: “of one substance”) The XCH of the inscriptio has me reaching, > true, but i think i am following the right track but don't quote me on quod ! xD

NOTE: The n character in oranipotentis seems to function as a connector with no other value. I wonder if it works like a bindrune ?

An interesting note on both the bindrune thought and some [further] Greek connections come by way of the chi-rho symbol, see the spelling Xpisti below, which looks a little odd. ?

Settled so far...?

ORVI = ORUI the "u" serve the same function here.
Another example: sigillum = sigillvm == seal
So, ORVI, ORUI =

[O]mnipotentis, [R]edemptoris [U]niversorum [I]esu
Almighty God, the Redeemer of all Jesus

Xpisti = Christ, then what is C? Which again skews my results
below but, it's still neat how that turned out.


After playing for a bit I think this may be similar
to a variation of the Greek word for appeal,
so,

[X]pisti [C]hristi [H]omoousios

Doing a run from Latin >> Greek,

Xpisti Christi Homoousios >> Επίκληση Χριστός ομοούσιος
Phonetically --------------> Epíkli̱si̱ Christós omooúsios


then Greek to English

Επίκληση Χριστός ομοούσιος >> Invoking Christ consubstantial

I will temporarily add this idea to my translation in progress but i am not settled on it. See consubstantiality .

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From the Russian site;

+NDXOXCHWDRGHDXORVI+ <--this is from the article

+NDXOXGHMDnCHDXORVI+ <---this is from that site of known translations at the end of section one of my answer.

Russian

Во имя господа Христа всемогущего и матери Христа. Во имя матери господа нашего Христа. Во имя господа Христа всемогущего, искупителя вселенной Иисуса.

Latin

N(omine) d(omini) X(pisti) o(ranipotentis), X(pisti) g(enitricis). N(omine) m(atris) d(omini) n(ostri) C(hristi). N(omine) d(omi-ni) X(pisti) o(mnipotentis), r(edemptoris) u(niversorum) I(esu).

English

In the name of the Lord Jesus Christ almighty, and mother. In the name of the mother of our Lord Christ. In the name of God the almighty Christ, redeemer of the universe of Jesus.

I think the "W" could be attributed to illiteracy or the error that comes with repetition. The "lowercase" is probably what i thought it to be.

I'm still puzzling out particulars, there are letter "substitutions" and so, "alternate" spellings to sort through.

Google translate is a HORROR! [OMG] Any clergy worth their salt should go there and start fixing it, please!

Note: I believe the "C" and the "G" are backwards...

+ NDXO XGH WDnCHDX ORVI +

Settled mostly....    
 +<
 In nomine Patris et Filii et Spiritus Sancti, Amen,

Latin
[N]omine [D]omini [X]pisti, [O]ra i potentis


to Greek - phonetic below
Προσεύχομαι στο όνομα του Χριστού, ο ισχυρός
Proséf̱chomai sto ónoma tou Christoú, o ischyrós

to English
I pray in the name of Christ, the powerful

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???? Going on the G tip =p, same move, Latin->Greek->Английский

This is still a guess.

Latin
[X]pisti [G]enetricis? [H]omoousios ?

to Greek - phonetic below
Μητέρα του Χριστού ομοούσιος
Mi̱téra tou Christoú omooúsios

to English

Mother of Christ consubstantial

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[O]mnipotentis, [R]edemptoris [U]niversorum [I]esu
Almighty God, the Redeemer of all Jesus

 >+
 In nomine Patris et Filii et Spiritus Sancti, Amen,

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Final Guess.

Based on the suggestion by commentator Philip Seddon , The latter "H" characters may be seen as indicators of a feminine denominator, meaning N = H as covered earlier in my answer on the subject of runic characters interchangeability/similarity/substitution etc..

Also, the subject of the misidentified "R" being a "lowercase" n and, the "C" later "G" actually being "G" later "C", AND, on my almost certainty that "X" is not a "placeholder/seperator" but an alternate "C" and lastly the "W" being downside-up "M", although I believe a double "U" e.g. "VV" could be just as like but, I couldn't see/find a fit.

+NDXOXGHMDnCHDXORVI+

+<
In Nomine Patris et Filii et Spiritus Sancti, Amen,

N      D      X       O
Nomine Domini Christi omnipotentis, 


X       G          H      M      D      n      C
Christi genitricis Nomine Matris Domini nostri Christi,

H      D      X       O            R           V           I
Nomine Domini Christi omnipotentis redemptoris universorum Iesu

>+
In Nomine Patris et Filii et Spiritus Sancti, Amen,

So,

Nomine Domini Christi omnipotentis, 
Christi genitricis Nomine Matris Domini nostri Christi,
Nomine Domini Christi omnipotentis redemptoris universorum Iesu


the name of our Lord Jesus Christ Almighty,
the name of the Mother of Christ, Mother of our Lord Christ,
the name of Jesus Christ Almighty Redeemer of all

I'm still not satisfied with my answer and have clearly hit my limit of skill with this. I hope that by turning what i have so far over to Community Wiki [and a penalty free format] will attract some more users willing to jump in. It's a neat mystery and I want to know what the inscription actually is.