Second Confederacy of Independent Systems (Lord Sidious)

The Second Confederacy of Independant Systems was formed in 23 ABY by the Imperial Chancellor, Kyle Kusan. Kusan had become irritated with taking orders from Ardy Castman. He and General Grievous went to the Galactic Senate, convinced some Senators and a few other people, and then went to Mustafar, where he started the Separatist High Command.

Forming the High Command
Because Kusan was Chancellor, he had a huge amount of power over the Senate, and so managed to convince many Senators to join the CIS II. Kusan and those Senators disappeared for 5 months before a mysterious message was sent to General Castman, leader of the Imperial Army and General Tantor. It said that they had a new enemy. A clone of Emperor Palpatine was shown the message. Tantor reacted by asking the Emperor for help. The Imperial-Clone Army had been born.

Defection of Grievous
After the death of Kusan in 29 ABY, Grievous was in control. He hatched a plan, using the spy, Soy Fac. The plan worked, and resulted in the assassination of Brenn Tantor. Now, Brenn's weaker brother, Dellis took over. Grievous then went to his new master, Emperor Palpatine. Somehow, Grievous was able to tamper with Clone HoloNet Units and able to issue Order 66. The clones turned to the Jedi Temple, but they were repulsed. However, Coruscant was lost. Grievous finally destroyed the CIS by killing the members of the Separatist High Command and deactivating the Separatist Army.

Restoration
In 42 ABY, just before the Assault of the Yuuzhan Vong, a relative of Gizor Dellso restarted a battle droid fleet. The head of state, Leia Organa-Solo flew into his ship and nearly killed him which made him pledge his armies to her.