When Qurban was first exiled from the Continuum, it was at the hand of another Q later classified as the Quaestor. He interrupted a private meeting of the Vulcan Science Directorate with a depowered and unconscious humanoid at his feet and gave only the tersest of explanations: “This one is called Qurban. Keep him safe.”
The Vulcans quickly made the decision to remand the depowered Q to Starfleet custody, who in turn sent him to the furthest regions of Federation territory that could nonetheless be defended. The starbase constructed for his indefinite detention also came to hold items, objects, and other secrets deemed too sensitive or volatile for storage elsewhere. As such, Qurban was the first cataloged entry in Memory Theta.
Qurban’s curiosity mingled with his intellect, which made for a persistent and aggravating research assistant for the original Memory Theta staff.
The life of the Q is something which Qurban does not well remember, or at least that is his claim. After 10 years of mortal humanoid existence, his intellect is vastly diminished from the 2000 IQ points that the original Q claimed of himself during his brief time as a mortal. Qurban's exile from the Continuum has left him with a dwindling intellect and recollection which seems to become smaller with each passing year. The fear of becoming a "common genius" likely contributes to his defensiveness over his position and reluctance to accept help when offered. Most of his mortal existence has been spent on Memory Theta.