This is pretty much a constant with nearly everything in the series. Check out the name of the Trolloc clans if you ever get the time.



In his dealings with the 'finns to acquire their knowledge, Mat gave one eye and was hanged from the Tree of Life. He wields a spear which bears two ravens and the inscription "Thus is our treaty written; thus is agreement made.
Thought is the arrow of time; memory never fades.
What was asked is given. The price is paid.". Emphasis added.

I'm not very knowledgeable about Norse mythology, and I imagine there's more to it than that, but this is what I've noticed.

Rand is also parallel to Tyr, I think.

Or you could read it from people far more knowledgeable than I by following the link.