INT to AC (as dodge bonus) when using Combat Exp / Fighting defensively?

[meatshieldxx1]

I saw "something" that let you add your INT mod to your AC when fighting defensively or using combat expertise (believe it was both). I'm not sure if this was a feat, trait, ect. I saw it yesterday but couldn't get combat expertise but found a way around that (Lore Warden). Now I can't for the life of me find that again. Any ideas?

[RumpinRufus]

The Duelist prestige class?