The year III 2002 saw the capture of Gondor's tower of Minas Ithil by the Nazgûl, after which it became known as Minas Morgul. The Morgul nomenclature was also applied to the geography around the tower, so the valley it guarded became Imlad Morgul, the Morgul Vale, and the stream that ran out of that valley became Morgulduin the Morgul river. Before III 2002 Morgulduin would have had a different name, though that name is not recorded in any canonical source. Based on the tower's old name of Minas Ithil, and its association with the land of Ithilien, Ithilduin would seem to have been appropriate, and indeed this name does appear in a list of river names of Gondor (evidently referring to the stream later called Morgulduin) in volumes VII and VIII of The History of Middle-earth.
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