Count Dooku, also known as Darth Tyranus, was a powerful Sith Lord and the Head of State of the Confederacy of Independent Systems during the Clone Wars. During his time as a Jedi, Dooku excelled at saber combat and was even considered one the greatest swordsmen in the Order. After a dangerous mission confronting a group of Mandalorians with his then Padawan Komari Vosa, the venerable master began to doubt the Jedi Order and its teachings. Dooku fell under the influence of Darth Sidious and crossed over to the dark side. For this action Dooku became a member of the «Lost Twenty»; a group of the only Jedi Masters to ever willingly turn their back on the Order. The loss of Dooku was not only surprising but an emotional blow to those who had known him like his former master Yoda, former padawan Qui-Gon Jinn, and close friend Sifo-Dyas. In the end as final test from his Sith Master, Count Dooku killed Sifo-Dyas, the man who secretly visited the cloners on Kamino and petitioned them to create a clone army for the Republic.