He was Darth Sideous' apprentice.
No. He was not a Sith.
The One's i know are Darth Vader Darth MAul Darth Sidious and count Dooku There is an entire species of Sith, but many dark jedi are refered to as Sith
Jedi who are Dark-side users call themselves Sith, so yes.
darth sidious was the apprentice and darth plagues the wise was the master until sidious killed his master and took on an apprentice of his own, darth maul.
There are multiple, but you probably mean Darth Maul. He has a red double-saber, and horns on his head. Episode I.
Darth Maul was a Sith Lord who initially served the Trade Federation and later his own criminal syndicate. He was not directly aligned with the Separatists or the Galactic Empire, but he did come into conflict with both groups during the Clone Wars and the Galactic Civil War.
If by Episode 3 you mean Revenge of the Sith, then no.
There is no canonical references that explain who Darth Maul originally was. He was taken from him home planet of Iridonia and trained as a Sith by Darth Sidious. He was never a Jedi, and as he gave up his former identity to take the Sith title of 'Darth' his former identity is irrelevant, his tattoos indicate his loyalty to the Sith order. There are popular fan-fiction storied that identify Darth Maul's original name, but these stories are not licensed by Lucasfilm, and are therefore NOT official Star Wars cannon. Until Lucasfilm authorizes a book about Darth Maul's origin it will remain a mystery.
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Darth Maul is so awesome! But in IV, V, and VI, Darth Vader is the coolest.
I would say Darth Maul would win because he is a trained sith while Bossk is just a bounty hunter.
Why? He was interfering with the plans of the Sith, so the Sith lord ordered him, and his apprentice, killed and Sent his Apprentice, Darth Maul to accomplish the task. Apparently, Darth Maul was a superior swordsman. How? Because he was stabbed in the torso by a lightsaber wielded by Darth Maul, an energy blade that evaporated the part the torso it came in contact with.