Sumerian language
The non-Semitic source of the Sumerian language was established in the late 19th century by Julius Oppert and Henry Rawlinson from which many different theories were proposed as to its origin. In his works "Aryan Origin of the Alphabet" and "Sumer-Aryan Dictionary" (1927) Waddell attempted to show the Sumerian language was of Aryan (Indo-European) root.