Hurrian language
The Russian historian Alexandre Nemirovski claimed a strong similarity to the extinct Hurrian language of northern Mesopotamia, which had recently been partially deciphered at the time of the writing of "The Lord of the Rings", E. A. Speiser's "Introduction to Hurrian" appearing in 1941. Fauskanger corresponded with Nemirovski, and notes that Nemirovski argued that Tolkien designed Black Speech "after some acquaintance with Hurrian-Urartian language(s)." The evidence that Nemirovski presented for this is entirely linguistic, based on similarities of the elements of the agglutinative forms of Black Speech; Hurrian was similarly agglutinative.