In Daggerfall, you deliver a letter to Gortwog on behalf of Morgiah in return for info on the Emperor's letter.
http://www.imperial-library.info/tsod/morgiahsletter.shtml
It says: I agree to your terms. I will give you my first and you will exert your influence on the King of Firsthold on Sumerset Isle. Only you can let him speak with his dead son. For that, he would even marry Nulfaga!

The http://www.imperial-library.info/pge3/summerset.shtml says: The Queen of Firsthold, for example, is the Dunmer Morgiah, daughter of Barenziah and sister of the King of Morrowind, Helseth. Her children, Goranthir and Rinnala, though half-Altmer, are fully Dunmer in appearance, and stand to inherit the throne.

So did Morgiah never live up to her end of the deal? Did she ever give her first born child to Gortwog?

EDIT: One more thing, why do the queen & king of Summerset Isle (Morgiah & Karoodil) live in Firsthold? Shouldn't they live in the capital, Alinor?

I thought Morgiah?s deal was with Mannimarco, not Gortwog.

But if you want more info on Morgiah in Sumerset, here you go: http://www.imperial-library.info/obbooks/firsthold_revolt.shtml

It says right there in the game that it was with Gortwog. Can't really argue with that.
Thanks for the book link.

Fourth paragraph from http://www.imperial-library.info/tsod/morgiahsletter.shtml

It wasn't Gortwog. And it says that it was Mannimarco in the text you quoted.
Here's what Morgiah asks the hero to do:
"Qwerty, that is a relief to me. Do not ask any questions -- get this letter to a certain high level sorcerer at the Necromancers' crypt, Scourg Barrow in the Dragontail Mountains. Avoid the rift. If you see it, you have gone too far.

They will not be expecting you and will not wait for any introductions. The necromancers feel that death is a reward for the living, not a punishment. Once you have delivered the letter, they would feel no need to guarantee your safety. It is their way. I need the letter delivered and a response from King of Worms in my hand one month from now at the absolute latest. The risks are very high, Qwerty, please do not fail. "
and here's the actual letter:
"King of Worms,

I agree to your terms. I will give you my first and you will exert your influence on the King of Firsthold on Sumerset Isle. Only you can let him speak with his dead son. For that, he would even marry Nulfaga!

-- M

The dialogue of Morgiah only refers to Gortwog in terms of another letter the hero is seeking.

My bad, sorry. For some reason I got Gortwog's name mixed up with King of Worms. You're right.

How do you know it was her child? She only said she would her "first," which is highly ambiguous. For all we know, it could've been her first doll.

Game-wise, regarding Gortwog, Morgiah give info about Gortwog having the Emperor's letter to the player after the player deliver Morgiah's letter to the King of Worms.

Somewhere lurking in my brain, I remember somebody (Tedders probably, the guy who wrote this bit of the game) say that it wasn't her first-born child. So, it still is likely that she held up her end of the bargain.

So we'll never know what she meant when she said "first"? I'd assume it would be first child.

We'll probably know when there's a game in Summerset Ilse

When Ted Peterson participated in Loranna's RP several years ago, he wrote the characters Morgiah and many others (because he had written them during the making of "Daggerfall" as far as I know). Although it's not canon, he wrote that the first meant "first-born son". He wrote of a prince named Goranthir; when he's 18 or so, Goranthir is taken by Mannimarco to become one of his lieutenants, in a kind of possession. This was the story arc called "The War of the Wormgod". (Btw, Mannimarco was a hell of a lot more powerful in this RP than he was in "Oblivion", but that's another issue. Ted Peterson explains it in the RP by having Sheogorath knock Mannimarco down to size.)

Anyway, this isn't canon (though who knows what TES V will bring) but I thought it was worth recounting.

I dont like to comment on the coming novel, but i just can?t resist this time.

So just for the sake of argument: If Morgiah?s first was, in fact, her first-born child who was delivered to Mannimarco, could he be behind The Infernal City?

Is her named pronounced "Mor-gee-uh" or "Mor-guy-ah"?

I always assumed it's the latter, but I don't know if it's ever been said.

sort of supporting this, i recall the Daggerfall game guide saying that the "first" was not her first born child, but never clarifying further.

Perhaps the king of worms didn't care that much about some elf-kid anymore after becoming a god.

That's where it was.

And I'm in the former camp. But then again, what do I know. I pronounce Daedra like "Dai-dra."

There was a post made long ago by who I believe was Tedders or Julian which explicitly stated that it was not a firstborn child, at least to the best of my knowledge. Concerning pronunciation, I've always pronounced it "more-guy-uh" as it felt more Shakespearian to me (consider much of Daggerfall's theme and culture seem to be derived from such a mindset).

Mehrunes Dagon, I've always pronounced it like "day-dra", and Daedric as "day-dric". Of course, what with Baurus saying "dee-uh-dric" in Oblivion, I'm not sure what to make of this (I'm pretty sure other characters in said game used my pronunciation, of course). I'm sure there's plenty of different dialects, you know.