Name of Iran their country "Arya", "Iran", "Iranshahr", "Iranzamin" (Land of Iran), "Aryānām" (the equivalent of "Iran" in the proto-Iranian language) or its equivalents. The term "Arya" has been used by the Iranian people, as well as by the rulers and emperors of Iran, from the time of the Avesta. Evidently from the time of the Sassanids (226–651 CE) Iranians have called it "Iran", meaning "the land of Aryans" and "Iranshahr". In Middle Persian sources, the name "Arya" and "Iran" is used for the pre-Sassanid Iranian empires as well as the Sassanid empire. As an example, the use of the name "Iran" for
Indigenous Aryans of the land, whereas Brahmins were Aryan and alien. The upper castes had their own uses for the Aryan theory. Keshab Chunder Sen saw the English rule in India as a "reunion of parted cousins." The nationalist leader Bal Gangadhar Tilak endorsed the antiquity of "Rigveda", dating it to 4500 BC. He placed the homeland of the Aryans somewhere close to the North Pole. From there, Aryans were believed to have migrated south in the post-glacial age, branching into a European branch that relapsed into barbarism and an Indian branch that retained the original, superior civilisation. In contrast to the