Darth Malak

Darth Malak reigned as a Dark Lord of the Sith during the Jedi Civil War.He was trained in the ways of the Force by the Jedi Order, During the Mandalorian Wars, Malak, Revan—his closest friend —and their faction of Jedi disobeyed the Jedi Council and aided the Republic's war effort .He befriended a Jedi Padawan and, after taking the name "Malak" in order to avoid arrest by the Council, assisted him in defeating the secretive Jedi Covenant. As the war progressed, Malak became a military general and gained a reputation as astrong warrior who recklessly charged into danger. Malak and Revan defeated the Mandalorians , and pursued the surviving Mandalorians. However, the two Jedi encountered the Sith Emperor of the remnants of the ancient Sith Empire and fell to the dark side of the Force under his tutelage, becoming Sith Lords.Darth Malak and Darth Revan were given a mission to find the Star Forge, an ancient space station, which would help to destroy the Jedi Order and the Republic. After finding the superweapon above Revan assumed the mantle of Dark Lord of the Sith, with Malak becoming his apprentice. A year after their disappearance , the two founded their own Sith Empire, returned to the Republic, and declared war, determined to end the Jedi Order's supposed tyranny. . A short time later, after the Jedi dispatched a strike team to capture Revan and Malak, the latter betrayed his Sith Master, ordering the guns of his flagship to fire on Revan's vessel.

There's nobody left who remembers who I was before. But they'll remember Malak. I'll make sure of that."
―Darth Malak