Siamun Muran

Siamun Muran (シモン・ムーラン, Shimon Mūran), known as Shimon in the English anime, is a vizier of Pharaoh Atem. Sugoroku Mutou is the reincarnation of Siamun. When Atem goes to the World of Memory, he initially confuses Siamun by calling him "Grandpa". The name "Siamun" is pronounced the same as "Shimon".

He was originally one of the Pharaoh Akhenamkhanen's original guardians, and he was granted the Millennium Key to hold. His Ka (or his monster spirit) that he summoned was Exodia the Forbidden One and he swore to seal it and never use it again after he destroyed the force that was attacking the Egyptian capital. He apparently gave up his position of guardian to Shada, and to him he relinquished the Millennium Key.

He plays a largely minor role in the Millennium World arc as first, as he introduces much of the ancient ways and terminology to the Pharaoh Atem.

When Zorc Necrophades rises and begins to march on the city, Siamun takes up the Millennium Key that Isis brought back and he summons Exodia to combat Zorc. Although Exodia experiences some success, especially after Siamun demonstrates its ability to regenerate after its arm was torn off by Zorc, Zorc overpowers Exodia since its power is based on Siamun's, while Zorc can draw power from the darkness. Therefore, Exodia is destroyed and Siamun is killed. After Zorc was defeated by the Pharaoh Atem, it is likely that he still retained his position of vizier for the new Pharaoh: Seto.