Jul-Us is a member of the old Kryptonian Council which ruled the planet Krypton. He was the head of the council. When the capital city of Kandor was taken by Brainiac, the council probably remained in power, but only within the city of Kandor. Back on Krypton, it was replaced by an emergency government led by General Zod, which was soon overthrown by the House of El and their allies, predominantly forces from Argo City led by Zor-El.