The Elder Scrolls are artifacts of unknown origin and quantity in the game series of the same name, being simultaneously archives of historic, past and future events. The prophecies of the Elder Scrolls and the Heroes are interdependent; one cannot exist without the other.
Even experts of the scrolls no little about them, as the scrolls have the ability to change "fact". For example, they cant truly be organized, as you could count a group of scrolls, and every time come up with a different amount. In the point between Oblivion and Skyrim, all the scrolls the empire collected vanished for no known reason.