Yergong was a Human male Jedi Knight during the Eragunus Time Period. He hated Yibens and attempted to destroy them. Yibens did not age, so they had to be murdered, a task typically carried out by Jedi. Considering this fact, Ven Queso was still alive. By that point, he was known to the Jedi and worked with them, but Yergong never approved of that. He was in many lightsaber battles with Ven, their final one leading to Ven's death. Yergong had a green lightsaber and enjoyed creating weapons.