Xendor

Xendor was a Kashi Mer Jedi around the time of The Great Schism, and was also believed to be the first Dark Jedi. He used the Dark Side of the Force to reinforce his Teräs Käsi techniques in combat, causing him to be exiled by the Jedi Order. After being banished, he gathered a large following of other Dark Jedi, known as the Minions of Xendor. Xendor was later killed by the Jedi Order.