Darth Maul is a man fueled by his hatred for the Jedi, and he has the Emperor is to thank for that delightfully narrow-minded agenda. The Dark Lord of the Sith took Maul in as his apprentice and molded the young man into the ultimate killing machine. Maul underwent fierce reprimands for showing any weakness and was tested with a number of missions.
When he finally earned the Darth title, Sidious sent Maul across the galaxy which including assassinating a variety individuals and even bringing together two companies. As we all know, he was eventually sent to kill the Jedi interfering during the Invasion of Naboo, and the end result was a lightsaber through his torso.