Indigenous Aryans were inter-related, and the notion of biological race came to the forefront The "Aryan race," the presumed identity of Indo-European language speakers was prominent among such races, which was seen to be further subdivided into "European Aryans" and "Asian Aryans," each with their own homelands. Max Mueller, who translated the Rigveda during 1849–1874, postulated an original homeland for all Aryans in central Asia, from where a northern branch was believed to have migrated to Europe and a southern branch came to India and Iran. The Aryans were fair-complexioned Indo-European speakers who conquered the dark-skinned "dasas" of India. The upper castes,
Balochistan either a proper name "milu-akam" (from which "tamilakam" was derived when the Indus people migrated south) or "melu-akam", meaning "high country", a possible reference to Balochistani high lands. Historian Romila Thapar also interprets "Meluḫḫa" as a proto-Dravidian term, possibly "mēlukku", and suggests the meaning "western extremity" (of the Dravidian-speaking regions in the Indian subcontinent). A literal translation into Sanskrit, "aparānta", was later used to describe the region by the Indo-Aryans. During the time of Alexander the Great (356-323 BC), the Greeks called the land "Gedrosia" and its people "Gedrosoi", terms of unknown origin. Using etymological reasoning, H. W. Bailey reconstructs