Agon Nine, at first called Turallon, existed as a planet located within the Agon system found in the Outer Rim Territories.
As he broadened the reach of Xim's empire originating from the Kingdom of Cron around 25,127 BBY, Agon Nine became a part of it. Following the fall of that empire, Turallon faded from memory for many centuries; that is, until Galactic Republic scouts came across it sometime after the conclusion of the Great Hyperspace War.