Mat was one of the characters I was thinking of actually (Hung in exchange for wisdom, a raven on each shoulder, a strange spear and hat, he obviously borrows a lot from Odin, though I didn't realize it until the very end with the "Half the light of the world" stuff because it was so gradual and I was pretty excited when I figured it out) and there's a character in another series I forgot the name of, something to do with gates and alternate worlds that provide magic, who also has a magic spear, trades an eye for knowledge, and has a raven giving her advice. I don't know any myths about Odin having an awesome cape though, which is probably Cat's biggest artifact right now.
I saw the comments mentioning this might be the Prince's Graveyard, but I don't remember much about it. I know the name has shown up a lot in the chapter headers, and I recognize the phrase "7 princes and 1" that somebody brought up. I think I just assumed that the "Prince's Graveyard" was that battle they mentioned where Nauk shot the Prince, though I don't think anybody ever actually called it that, and they had another name for it, iirc. Going in, I guess we know Cat wins (or it at least shows off how she does battle now) and a bunch of Princes die if it is that battle, but I'm pretty excited to see how it all plays out. There's a lot of moving parts coming together, and I'm hoping Hakram and his army will show up for it too.
Sometimes I really get into the politics of this series too. I liked a lot of the stuff going on in Procer and the Dominion, or at least I found it interesting. Leaders being forced to make decisions they don't like in order to maintain at least some control over the situation. (I probably shouldn't say I "liked" that the one guy had to whip his son, but I did like the reasoning) Plus, Cat recently learned that the Bard might be influencing the Augur, which means she could be orchestrating this whole thing, since at least some of this is because the Augur said it was necessary.