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Scimitar
The Scimitar is a sword which appears in Assassins Creed, Assassins Creed II and Assassins Creed: Brotherhood, though it is not purchasable in Brotherhood. That also aplies to the Maul. Both weapons can, however, be acquired from a guard, by retrieving it while equipped with an empty heavy sheath. The sword is pretty powerful and it is a shame you cannot buy it.
The Scimitar is an old Middle Eastern sword with a curved blade.
(see Scimitar on wikipedia)