Darth Perfidious was a Human male Sith Lord of the Sith Empire during the Great Galactic War. He was born under the name of Benla "Ben" Vidar within Republic space on Corellia, and raised by his mother and father. While still a young adult at the age of 20, Ben killed a Zabrak male, by way of Force Strangulation, for cheating at a game of Sabacc which Ben was about to win. The authorities of Corellia, upon learning of the manner of which the Zabrak has died, hunted Ben for not only murder, but for use of the Dark Side of the Force as well. Ben was able to evade the authorities for 3 days until he managed to escape the planet via cargo shipments being sent off-world. At the same time as this happened, the Great War between the Sith Empire and Galactic Republic had commenced.