The First Jedi Purge was when Darth Traya, Darth Nihilus, and Darth Sion formed the Sith Triumvirate. They made it their goal to eliminate all the Jedi in the galaxy. It was a slow process at first, but the purge went quicker once Nihilus and Sion betrayed Traya. Darth Sion tracked down and brutally murdered countless Jedi while Darth Nihilus sought out Force-sensitive worlds with his fleet and completely consumed them. By the end of the First Jedi Purge, only a few Jedi Masters remained alive. Meetra Surik found them, received training from them, and eliminated the Sith that enacted the purge. After that, she helped reform the Jedi Order.