Darth Maul

Darth Maul was a Sith Lord who, with his brother Savage Opress, struck a deal with the Death Watch to help them take over Mandalore establish an army of criminals, and together they were able to take over Mandalore. However the Death Watch betrayed the criminals at the end, including Maul and Opress. However the two brothers broke out of prison, and Maul challenged Pre Vizsla to a duel, besting him. Maul then took control of Mandalore, but Bo-Katan Wiki and several loyalists objected and fled. Maul's forces were soon driven from the planet, and Maul disappeared. Sometime later, he perished in a duel with Obi-Wan Kenobi in 2 BBY.