Obi-wan kenobi

Obi-Wan Kenobi was responsible for killing General Grievous and wielded a single bladed blue lightsaber.

Grievous seemed to think of Obi-Wan as his arch enemy, and would frequently question hismself about his skills. They battled many times throughout the Clone Wars, but in the end, Obi-Wan won. Years later, Obi-Wan was killed by Darth Vader (Anakin Skywalker), his own Apprentice.