Qymaen jai Sheelal (Earth-2042)

"I'm no errand boy. And I'm not in this war for Dooku or Truth's politics. I am the leader of the most powerful army the galaxy has ever seen!"

- General Grievous, to Obi-Wan Kenobi

Grievous, born Qymaen jai Sheelal, was a male cyborg Kaleesh and Supreme Commander of the army of the Confederacy of Independent Systems for most of the Clone Wars. Originally an organic from the planet Kalee, he lived there for most of his early life. During the Kaleesh conflict against the Huk, Qymaen jai Sheelal quickly learned the art of war, specializing in a slugthrower rifle. Quickly amassing a great number of Huk kills, he became a demigod among his people. He eventually met the female Kaleesh Ronderu lij Kummar, a master with the sword. The two became very close before Kummar's death at the hands of the Huk. Heartbroken, Qymaen jai Sheelal renamed himself Grievous and turned all his anger and grief toward the Huk. Aided by his elite, he forced the Huk off Kalee and then swarmed their homeworld, conquering them. The Huk turned to the Galactic Republic for help, and the Kaleesh were forced back to their own world by the GRSC and left to starve.

Source

 * https://starwars.fandom.com/wiki/Grievous/Legends