Grievous

Grievous was a cyborg who served as the Supreme Commander of the Droid Army and later the second Head of State of the CIS.

Background
At some point, Grievous joined the Separatists and quickly became known for being a violent Jedi killer who collected the lightsabers of his victims. Because he had four arms, he could wield four sabers at a time.

Battle over Coruscant
In 19 BBY, Grievous led the Separatist Navy in an attack on Coruscant and he captured Supreme Chancellor Palpatine. This led to the Battle over Coruscant between the Separatist Navy and the Republic Navy. During the battle, Anakin Skywalker and Obi-Wan Kenobi rescued Palpatine and killed Dooku. Grievous was forced to abandon ship and he travelled to Utapau.

Death
Following Dooku's death, Grievous took the role of Head of State of the CIS. The Galactic Republic prioritised finding and killing Grievous. He was eventually located on Utapau and killed by Kenobi during the Battle of Utapau.

Appearances

 * Star Wars: Revenge of the Sith (First and only appearance)