Darth Bane

Darth Bane was an important Dark Lord of the Sith. He instituted the rule of two.

In-Universe information
Born as Dessel on the Cortosis mining world of Apatros to an abusive, drunkard father named Hurst, Bane was a major Sith lord in galactic history. His mother died bringing him into the world, and so his father hated him, so much so that he began referring to his son as "bane". One night, when he was eighteen, his father beat him so badly that he passed out, taking it all without a sound. He wished his father dead, imagining a giant hand crushing his heart. His father was the first person he murdered with the Force. After killing a Republic solider, he escaped Apatros and joined the Sith army, which led to him being discovered as Force-sensitive and being taken to the Sith academy on Korriban to train as a SIth lord. Realizing that his order was wrong, Bane tricked them into destroying themselves and founded a new Sith philosophy, the rule of two, and took the Sith into hiding He took a human female as his apprentice. This female became known as Darth Zannah. Over the course of one thousand years, Bane's order, the Order of the Sith lords, grew in power until the time of Darth Tenebrous, Darth Plagueis, Darth Sidious, Darth Maul, Darth Tyranus and, finally, Darth Vader.