Actually, Peorth being the Goddess of Forever happens to be a fan idea. 
I've never seen it in the manga. What I have heard is that the word

Peorth 

means secret or mystery in another language. Can't remember which.

Peorth is a rune, yes, meaning secret.

I had thought Peorth was in a different goddess agency.  Wouldn't that
place her in a different pantheon, where the rules as we know them wouldn't
apply?  I.e. she could be a competing "Goddess of the Present".

Peorth, in the manga, IS from a rival Goddess agency. She is the Goddess'
aunt and is rather flakey. (And is, like the other goddesses, a babe.)

The closest parallel this has to the actual mythology is that the Asgardian
gods aka the Aesir (which, btw, does NOT include the Norns - even Odin had
to answer to the Norns) have a rival faction of gods called the Vanir, who
live on another branch of Yggdrasil. (Making the place they live Vangard?)

The Dead resided in Niflheim, watched over by Hel, the Goddess of the dead.
The Humans lived in Midgard, basically where we are now.
Jotunheim was the land of the Giants.
And Muspelheim - the land of fire and demons.

Since the Norse worshipped the Aesir, naturally, this made the Aesir the
greater bunch of gods, and placed them at the center of the branches of
Yggdrasil. Which makes me wonder if there were any Vanir worshippers... but
I digress. 

The Vanir had parallels to the Aesir, which, if applied to the manga,
reinforces the idea that Peorth has the same job as, oh, Belldandy, albeit
from a different company. 
Kinda like Coca-Cola and Pepsi. Both are colas, but from different companies.

I hope this random babbling helps clear things up.


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