so, in the book "The Great War", it mentions Titus Mede II may have been Wielding Goldbrand


Now, Goldbrand is one of Boethiahs artifacts, is it not?


is it ever said what kind of deal he struck with the Daedric prince to be able to wield such a relic?

Savior's Hide, artifact of Hircine, can be found in a locked wardrobe in Tel Fyr by the Nerevarine in The Elder Scrolls III: Morrowind. The point is that you don't necessarily have to make a deal with a Daedric Prince to come into possession of one of their artifacts as long as it is already on Nirn.

But no I don't believe how he came into possession of Golbrand was ever mentioned.