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In this article, we have discussed on the reasons of Ali Emiri Efendi's critics to Mehmet Fuad Köprülü. In this connection, we considered on Ali Emiri's personal and literal features, the general character of Köprülü's early writings and Ali Emiri's point of view to them, the story of Dîvânü Lügati't-Türk's publication and finally the writings in which has publlished newspapers, declared that the devation of Millet Library was lie.