All RPG (Role-Playing Games) developed for the Xbox console.
This list is sorted by Listal popularity.
Xbox RPGs was largely ignored because the majority of the big RPG developers were Japanese (Square Enix, Capcom, Konami, Namco) and since Japan in general has all but dismissed Microsoft's emerging console, the developers took a pass on it. But with huge RPG hits like Fable, Knights of the Old Republic, Morrowind, and the critically acclaimed Jade Empire appearing exclusively on Xbox and PC systems, the traditional japanese RPGs took notice of it and are being brought back, this time into the Xbox 360 console.
I think I've got most of them, but if missed one, please let me know via comments below.