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Commander Samaul is a level 40 quest giver located in Foothold Citadel on Theramore Isle in the contested territory of Dustwallow Marsh.
He starts the quest  The Missing Diplomat (14).
See List of Dustwallow Marsh NPCs.
Commander Samaul, along with Captain Garran Vimes, is probably a reference to Commander (formerly Captain) Samuel Vimes of the Ankh-Morpork City Guard, in the popular Discworld series of novels.