Human mind created differentiation between human beings have killed humanity in this world which we can see across the globe that some people who are white living in cold weather for long period of time, generation and generation Caucasian race originated from Caucasus mountain region are white in their feature who gave their own designation for name and fame as "Aryan" which means noble. They consider themselves as a superior human being than rest of the colour's people who are dark skinned, black especially those living in tropical region such as Africa although it has archaeologically proven that we all human race is originated from Africa around 200,000 years ago then migrated from there in different time period in different parts of the world seeking food, shelter and else for better life and livelihood.
members and rulers which we can read and understand from his life stories documented in Buddhism scripture "Tripitak". After he became Buddha at the age of 35 he devoted his whole life to educate and awaken human beings in mind so that they can themselves help to be free from any dogmatic ideological belief of goddism and fatalism indoctrinated from their early childhood and making them belief them that they are helpless without an imaginative figure or idol called "GOD" that is under the control of priestly and ruling class people only who can bridge between so-called God and People.
Despite trying best for the last 45 years till Buddha died at the age of 80 still human suffering in Nepal and India we can find now. It is just because of the law of manu, "Manusmriti" which was written during Sunga Dynasty of India that ruled from 185 BCE to 75 BCE re-established and institutionalised firmly wiped out varna system by ruling and priestly class people know as "Aryan".
In the context of Nepal linguistically speaking we've to set of people: Indo-Aryan and Tibeto-Burmese. Indo-Aryan people who migrated from ancient India considered Tibeto-Burmese as Sudra thus treated them as Sudra and Vaisya as per the Civil Code of Conduct "Muluki Ain" written in 1854 by rulers of Nepal.
Although Siddhartha Gautam being a son of King considered "Aryan" but he never ever showed his supremacy that we can read from Buddhism scripture that is why his teaching has been liked and appreciated across Asia unlike Vedic teaching of Brahmins which has been confined to India and Nepal only. Anyway it is very interesting to read the evidence related Aryan and how they came to ancient India. I found an article titled "All about Indo-aryans, their history to present day, and how they are not the ‘rightist’ “Aryans” as the ‘West’ knows it" in the below link that says,
Who Were the Aryans?
Aryans, or more specifically Indo-Aryans, make their first notable appearance in history around 2000-1500 BC as invaders of Northern India. The Aryans were semi-nomadic Nordic Whites, perhaps located originally on the steppes of southern Russia and Central Asia, who spoke the parent language of the various Indo-European languages.
Latin, Greek, Hittite, Sanskrit, French, German, Latvian, English, Spanish, Russian etc. are all Indo-European languages; Indo-European, or more properly Proto-Indo-European (PIE), is the lost ancestral language from which those languages ultimately derive. The “Proto” indicates that the grammar and vocabulary of this long extinct language, probably spoken up until 3000 BC, are a hypothetical reconstruction by modern philologists. Just as Romance languages like Italian and Spanish derive from Latin, so Latin derives from PIE.
Indo-European philology traditionally used “Aryan” both to denote a people, understood racially or ethnically, and the language group itself (“Aryan speech”), irrespective of the race or ethnicity of the people speaking its various branches. In the wake of National Socialist Germany`s defeat, the term fell out of general scholarly use in both senses, and “Indo-European” (IE) became the preferred designation of the language group, “Indo-Europeans” of both the people who occupied the original Aryan homeland and their descendants, who gradually spread out across Europe, much of the Indian sub-continent, and parts of the Near East. Racial nationalists are not, of course, obliged to adopt the timid PC-lexicon of contemporary scholarship, but we should be aware of imprecision of “Aryan” as a racial or ethnic classification.
Arya, meaning “noble,” appears in various Indo-European languages. Its plural form (Aryas=”nobles”) was probably the name the Aryans used to describe themselves prior to their dispersal, and it may survive in Eire (Ireland) and certainly survives in Iran (Airyanam vaejo=”realm of the Aryans”). The discovery of thousands of such cognate words in widely separated languages, along with similar grammatical structures, led philologists to conclude, early in the nineteenth century, that most European languages had evolved from a common proto-language spoken millennia ago by a distinct people who gradually left their original homeland in a series of migrations, carrying their language with them.
Traditionally Greek, Latin and Sanskrit were considered the closest languages to PIE, and much of the reconstructed Aryan proto-language is based on them. Modern Lithuanian, however, is the most archaic living language, closer to the original Aryan speech than any other. There is even an IE language, Tocharian, attested in Chinese Turkestan, which indicates that Aryans must have made an appearance in the Far East, a long-standing piece of linguistic evidence which has been recently confirmed by the discovery of the physical remains of a blond-haired people in China.
With all-outstripping chariot-wheel, O Indra,Thou, far-famed, hast overthrown the twice ten kings …Thou goest from fight to fight, intrepidlyDestroying castle after castle here with strength. (RV 1.53)The Aryans were remarkably expansionist, and almost everywhere they went they conquered and subjugated the indigenous peoples, imposing their languages and (to varying degrees) their religious beliefs on the natives, and receiving in turn contributions from the peoples whom they conquered. Aryan invasions — or more accurately, a long sequence of different invasions by speakers of Indo-European languages — swept across Old Europe beginning as early as the fourth millennium BC, and over time the conquerors and the conquered melded into specific peoples with distinctive languages. Most of the contemporary inhabitants of Europe, along with their respective early national cultures, are the result of interaction between successive waves of Aryan invaders and culture of the particular White people that they conquered and with whom they later intermarried, and as a result almost all modern European languages are members of the Western branch of the IE family tree.The birth of a European culture, however, predates the arrival of the Indo-Europeans: The cave art of Lascaux, which some have identified as the first flowering of Western man`s creative genius, was the work of Old Europeans, as were Stonehenge in the North and the Minoan Palace culture of Crete in the South. A pan-European religious symbolism had already evolved, much of which was later incorporated into IE mythologies, including various regional adaptations of the ubiquitous Old European reverence for the Mother Goddess. Many of the principal figures in Greek mythology predate the arrival of Aryans, and during the course of ancient history Old European religious beliefs and practices continually reasserted themselves. [Image: Minoan snake goddess, from the Palace of Minos, circa 1600 BC]
Europe is European because the conquerors and the conquered were members the same White race, different branches on the same family tree; India is a morass of poverty because the bulk of the conquered, with whom the Indo-Aryans eventually intermarried, were non-White Veddoids. The lesson is obvious. Even today high-caste Hindus can still be identified by their Caucasian features and light skin, and the poorest and most backward parts of India are generally the darkest. As an aside, recent genetic studies have indicated that the Basques of Aquitaine and the Pyrenees are probably the purest form of Old Europeans as they existed prior to the arrival of Indo-European invaders. They evidently emerged from the invasions of Europe unconquered, and they remained sufficiently isolated to retain their own unique, non-IE language. Indo-Aryans From Wikipedia, the free encyclopedia Total population: ca. 500 million Significant populations in: Indian subcontinent, with minority populations on all continents. Language: Indo-Aryan languages Religion: Dharmic religions, Abrahamic religions, Zoroastrianism, Bahai Faith. Related ethnic groups: Iranian, Dardic, and Nuristani peoples. The Indo-Aryans are the ethno-linguistic descendents of the Indic branch of the Indo-Iranians.  The earliest records of Indo-Aryans are in the Rigveda, and in references to the Mitanni rulers. The Indo-Aryans inhabiting northern India, the bearers of the Vedic civilization are sometimes called Vedic Aryans, precursors of modern Hinduism. The term derives from the Sanskrit word “Arya”. Pre-Vedic Indo-Aryans The separation of Indo-Aryans proper from Proto-Indo-Iranians is commonly dated, on linguistic grounds, to roughly 1800 BC. The Nuristani languages probably split in such early times, and are either classified as remote Indo-Aryan dialects, or as an independent branch of Indo-Iranian. It is believed that by 1500 BC, Indo-Aryans had reached Assyria in the west and the Punjab in the east. The spread of Indo-Aryan languages has been connected with the spread of the chariot in the first half of the second millennium BC. Some scholars trace the Indo-Iranians (both Indo-Aryans and Iranians) back to the Andronovo culture (2nd millennium BC). Other scholars like Brentjes (1981), Klejn (1974), Francfort (1989), Lyonnet (1993), Hiebert (1998) and Sarianidi (1993) have argued that the Andronovo culture cannot be associated with the Indo-Aryans of India or with the Mitanni because the Andronovo culture took shape too late and because no actual traces of their culture (e.g. warrior burials or timber-frame materials of the Andronovo culture) have been found in India or Mesopotamia (Edwin Bryant. 2001). The archaeologist J.P. Mallory (1998) finds it “extraordinarily difficult to make a case for expansions from this northern region to northern India” and remarks that the proposed migration routes “only gets the Indo-Iranian to Central Asia, but not as far as the seats of the Medes, Persians or Indo-Aryans” (Mallory 1998; Bryant 2001: 216). Other scholars like Asko Parpola (1988) connect the BMAC with the Indo-Aryans. But although horses were known to the Indo-Aryans, evidence for the presence of horse in form of horse bones is missing in the BMAC (e.g. Bernard Sergent. Genèse de l’Inde. 1997:161 ff.). Asko Parpola (1988) has argued that the Dasas were the “carriers of the Bronze Age culture of Greater Iran” living in the BMAC and that the forts with circular walls destroyed by the Indo-Aryans were actually located in the BMAC. Parpola’s hypothesis has been criticized by K.D. Sethna (1992) and other scholars. Vedic Aryans The first undisputed horse remains in India are found in the Bronze Age Gandhara Grave culture context from ca. 1600 BC (although there are claims of horse bones found in Harappan and even pre-Harappan layers). This likely corresponds to an influx of early Indo-Aryan speakers over the Hindukush (comparable to the Kushan expansion of the first centuries AD). Together with indigenous cultures, this gave rise to the Vedic civilization of the early Iron Age. This civilization is marked by a continual shift to the east, first to the Gangetic plain with the Kurus and Panchalas, and further east with the Kosala and Videha. This Iron Age expansion corresponds to the black and red ware and painted grey ware cultures. Ancient India The Vedic Kuru and Panchala kingdoms in the first millennium became the core of the Mahajanapadas, archaeologically corresponding to the Northern Black Polished Ware, and the rise of the Mauryan Empire, and later the medieval Middle kingdoms of India. Contemporary Indo-Aryans Contemporary speakers of Indo-Aryan languages are spread over most of the northern Indian Subcontinent. The largest group are the speakers of the Hindi and Urdu dialects of the India and Pakistan, together with other dialects also grouped as Hindustani, numbering at roughly half a billion native speakers, constituting the largest community of speakers of any Indo-European language. Other Indo-Aryan communities are in Nepal, Bangladesh and parts of Afghanistan. Of the 23 national languages of India, 16 are Indo-Aryan dialects (see also languages of India). The only Indo-Aryan branch surviving outside the Indian Subcontinent and the Himalayas is the Romany language, the language of the Roma people (Gypsies). The word does not have any racial connotation, and the skin color of the modern Indo-Aryan peoples varies from very pale to very dark, comparable to the full range of skin pigmentation found in humanity as a whole. Similarly many modern scholars have also disputed earlier claims about the early Indo-Aryans’ racial characteristics, who were earlier thought to be the “tall, blond, white race”. Unfortunately for the Hindus, today the word Aryan has become a stereotype for the white supremacists. Indian subcontinent Hindustani is an umbrella term for various dialects descended from the Prakrits of medieval India. The largest of these are the Hindi and Urdu languages. Hindustani speaking people inhabit modern-day Pakistan and northern India. During the British Raj, this region was identified as “Hindustan”, the Persianfor “Land of the Hindus”. Related languages are spoken all over Indian subcontinent, from Bengal to Sri Lanka and the Maldives.
(Source: Who were the Aryan? access from http://www.indoaryans.org/)