P7E was a Minyan spaceship.
After the Nuclear war that destroyed the Minyan civilization, the P7E left for the stars presumably to settle on some distant world. They brought with them the Race Banks of their people. They were caught in a Nebula which resulted in the ship being turned into a planet. Instead of settling on a new world they became one. Its people survived and became the descendents of a bizarre culture enslaved by the Oracle. (DW: Underworld)