The Progenitor Dragons are Siberys, Khyber, and Eberron. The Legend of the origin of the world of Eberron, states that the three dragons created (or discovered) the Draconic Prophecy. Then Siberys and Khyber began to fight over it, the battle destroyed the world, and killed Siberys (and creating the Ring of Siberys). Eberron then used her own body to bind and trap Khyber in the depths of the world, and at the same time restore life to the world, now called Eberron.