I know that "Irish is the language of the Druids" can be said in several ways in Irish.

Which of these are correct options?

Is teanga na nDraoithe an Ghaeilge
Teanga na nDraoithe is ea an Ghaeilge

I'm assuming in both that "an Ghaeilge" is correct because I'm talking about the entirety of the language.

Are either of those two correct, and are there other options?

Is oth liom a rá nach bhfuil ceachtar den bheirt ceart.

It's an identification sentence, so: Is í teanga na nDraoithe an Ghaeilge, but the usual order is Is í an Ghaeilge teanga na nDraoithe.
In the CO is ea is used only in classification sentences (but Munster speakers often ignore that).
Edit: Labhrás posted while I was editing some typos.

Both aren't correct.
"teanga na ndraoithe" is definite (the language of the druids) so a pronoun must separate it from "is"
So:
Is í teanga na ndraoithe an Ghaeilge.
or rather
Is í an Ghaeilge teanga na ndraoithe.

As well, "is ea" can only be used with indefinite predicates
(Teanga is ea an Ghaeilge = Irish is a language)

Must the pronoun separate it from "is" or can the pronoun be used elsewhere?

e.g. Is teanga na ndraoithe í an Ghaeilge.

No, it can't be elsewhere in identification sentences
Is í ...

In classification sentences (indefinite predicate) the pronoun is next to the second noun (subject)
e.g.
Is teanga í an Ghaeilge = Irish is a language.

Ah, tuigim! GRMA

OK, I get that "Is í...." should be at the start because both halves of the identification clause are definite, but why does
"..an Ghaeilge..." come before "..teanga na nDraoithe..."??

Irish is a language
Irish is the language

Is teanga í an Ghaeilge
Is í an Ghaeilge an teanga


The indirect moves before the í in the identification, but the "subject" stays in the same place either way (right after the í)

This is my layman's explanation, not being as familiar with the grammatical terms as Labhrás, for example

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No, usually the predicate is always first.
Because Irish is a predicate-subject-object language.

But in identification sentences the predicate or subject can be first.
Cé hé an feirmeoir? Is é an t-amadán an feirmeoir. (an t-amadán = predicate)
Cé hé an t-amadán? Is é an t-amadán an feirmeoir. (an t-amadán = subject)

In case of an Ghaeilge ... Gaeilge is rather a proper name than a normal noun.
Proper nouns* usually always come first in such sentences.

Is é Pól an t-amadán (usually not: Is é an t-amadán Pól)
and so
Is í an Ghaeilge an teanga.

*) as well as nouns with demonstrative adjectives, demonstrative pronouns and pronouns of 1st or 2nd person
Is é an feirmeor seo an t-amadán
Is é seo an t-amdán
Is mé/mise an t-amadán.

Thank you, a Labhráis
I knew that I was not explaining it well. I am familiar with the word predicate only in the English sense where it means all of the sentence except the subject (or at least that is what I think it means). I did not realize that was even the name for the second noun involved in a copular phrase (or whatever they are called)

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