After the Battle of Endor, the Galactic Empire was without an Emperor. For several years Sate Pestage ruled from Coruscant, followed by Ysanne Isard. During this time many ranking Imperials broke away from Coruscant's rule to form their own Empires.
After the capture of Coruscant by the New Republic, Grand Admiral Thrawn led Imperial forces into many victories before his demise at Bilbringi. After this, much of the Imperial forces retreated to the Deep Core, under the leadership of a cloned Emperor Palpatine, and numerous warlords such as Harrsk and Teradoc.
Intelligence reports that Admiral Daala briefly tried to unite the warring factions. She achieved this, but ultimately left them under the command of Admiral Gilad Pellaeon.
Much of the Empire's remaining strength is now located on the Outer Rim under Pellaeon's command. He is believed to answer to a council of Moffs. The location of the current Imperial capital, codenamed Bastion, is a closely guarded secret.
The renegade Eighth Imperial Fleet is not completely unknown to the Remnant, and on rare occasions, Imperial defectors have fled into the Unknown Regions in search of the rumoured lost fleet. However is is not believed that the Remnant is aware of the Goa'uld or the Stargate system, or the New Republic's secret war.