reached India by a language transfer from west to east. In 19th century Indo-European studies, the language of the Rigveda was the most archaic Indo-European language known to scholars, indeed the only records of Indo-European that could reasonably claim to date to the Bronze Age. This primacy of Sanskrit inspired scholars such as Friedrich Schlegel, to assume that the locus of the proto-Indo-European homeland had been in India, with the other dialects spread to the west by historical migration. With the 20th-century discovery of Bronze-Age attestations of Indo-European (Anatolian, Mycenaean Greek), Vedic Sanskrit lost its special status as the most archaic Indo-European language known. Aryan "race" In the 1850s Max Müller introduced the notion of two Aryan races, a western and an eastern one, who migrated from the Caucasus into Europe and India respectively. Müller dichotomized the two groups, ascribing greater prominence and value to the western branch. Nevertheless, this "eastern branch of the Aryan race was more powerful than the indigenous eastern natives, who were easy to conquer". Herbert Hope Risley expanded on Müller's two-race Indo-European speaking Aryan invasion theory, concluding that the caste system was a remnant of the Indo-Aryans domination of the native Dravidians, with observable variations in phenotypes between hereditary, race based, castes. Thomas Trautmann explains that Risley "found a direct relation between the proportion of Aryan blood and the nasal index, along a gradient from the highest castes to the lowest. This assimilation of caste to race proved very influential." Müller's work contributed to the developing interest in Aryan culture, which often set Indo-European ('Aryan') traditions in opposition to Semitic religions. He was "deeply saddened by the fact that these classifications later came to be expressed in racist terms", as this was far from his intention. For Müller the discovery of common Indian and European ancestry was a powerful argument against racism, arguing that "an ethnologist who speaks of Aryan race, Aryan blood, Aryan eyes and hair, is as great a sinner as a linguist who speaks of a dolichocephalic dictionary or a brachycephalic grammar" and that "the blackest Hindus represent an earlier stage of Aryan speech and thought than the fairest Scandinavians". In his later work, Max Müller took great care to limit the use of the term "Aryan" to a strictly linguistic one. "Aryan invasion" The excavation of the Harappa, Mohenjo-daro and Lothal sites of the Indus Valley civilisation (IVC) in the 1920,