Idun

Idun or Idunna ("Rejuvanator") was the goddess of eternal youth and of spring. She was the protectress of the golden apples of youth.

The Aesir ate the apples, in this way they could live till Ragnarok.

Idun was a Vanir, but became an Asynjur when she married Bragi.

Once, the giant Thjalzi kidnapped Idun and the Aesir grew old. But finally, Loki could rescue her, when he changed himself into a hawk. He flew with her, back to Asgard, where the gods waited for them. When Thjalzi came, in the form of an eagle, the Aesir made a fire, he couldn't fly no more and the gods killed him.

Loki spake:
"Be silent, Ithun! | thou art, I say,
Of women most lustful in love,
Since thou thy washed-bright | arms didst wind
About thy brother's slayer."
(Lokasenna)

I didn't found anything about her brother or his slayer.

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