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He is the Jedi who supposedly ordered all of the clones. He dissapeared over 10 years prior to AOTC.
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According to the Visual Dictionary for Episode 3, Sifo Dyas was murdered by Count Dooku as part of his initiation into the Sith and apprenticeship to Darth Sidious. Sifo Dyas was arranging cloning plans with Kamino etc., and to cover up Sidious' plans etc Dooku erased the records of Kamino and assumed Sifo Dyas' identity when he approached Lamu Su with plans for the army.