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Abhay Charanaravinda Bhaktivedanta Swami Prabhupada (Abhoy Charonarobindo Bhoktibedanto Shwamy Probhupad; 1 September 1896 - 14 November 1977) was a Gaudiya Vaishnavism spiritual teacher (guru) and the founder preceptor (Acharya) of the International Society for Krishna Consciousness (ISKCON), commonly known as the "Hare Krishna Movement". Adherents of the ISKCON movement view Prabhupada as a divine avatar and messenger of Krishna. Born Abhay Charan De in Calcutta, he was educated at the Scottish Church College in Calcutta. Before adopting the life of a pious renunciant (vanaprastha) in 1950, he was married with children and owned a small pharmaceutical business.
In 1922, when he first met his spiritual master, Bhaktisiddhanta Sarasvati Thakura, he was requested to spread the message of Chaitanya Mahaprabhu in the English language. In 1933 he became a formally initiated disciple of Bhaktisiddhanta. In 1944, (from his front room at Sita Kanta Banerjee, Calcutta), he started the publication called Back to Godhead, for which he acted as writer, designer, publisher, editor, copy editor and distributor. He personally designed the logo, an effulgent figure of Chaitanya Mahaprabhu in the upper left corner, with the motto: "Godhead is Light, Nescience is darkness" greeting the readers. In his first magazine he wrote: Under the circumstances since 1936 up to now, I was simply speculating whether I shall venture this difficult task and that without any means and capacity; but as none have discouraged me, I have now taken courage to take up the work. In 1947, the Gaudiya Vaishnava Society recognised his scholarship with the title Bhaktivedanta, (bhakti-vedanta) meaning "one who has realised that devotional service to the Supreme Lord is the end of all knowledge" (with the words Bhakti, indicating devotion and Vedanta indicating conclusive knowledge). His later well known name, Prabhupada, is a Sanskrit title, literally meaning "he who has taken the shelter of the lotus feet of the Lord" where prabhu denotes "Lord", and pada means "taking shelter." Also, "at whose feet masters sit". This name was used as a respectful form of address by his disciples from late 1967 early 1968 onwards. Previous to this, as with his early disciples, followers used to call him "Swamiji". From 1950 onwards, he lived at the medieval Radha-Damodar mandir in the holy town of Vrindavan, where he began his commentary and translation work of the Sanskrit work Bhagavata Purana. Of all notable Vrindavana's temples, the Radha-Damodara mandir had at the time the largest collection of various copies of the original writings of the Six Gosvamis and their followers - more than two thousand separate manuscripts, many of them three hundred, some even four hundred years old. His guru, Bhaktisiddhanta Sarasvati Thakura, had always encouraged him to print books, and beholding his spiritual master, Abhay felt the words deeply enter his own life - "If you ever get money, print books." referring to the need of literary presentation of the Vaishnava culture.
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why was he called Swamiji?

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Answer the question at the end by quoting:

The Vedic period or Vedic age (c. 1500 - c. 600 BCE) is the period in the history of the Indian subcontinent intervening between the end of the urban Indus Valley Civilization, and a second urbanisation which began in c. 600 BCE. It gets its name from the Vedas, which are liturgical texts containing details of life during this period that have been interpreted to be historical and constitute the primary sources for understanding the period. The Vedas were composed and orally transmitted by speakers of an Old Indo-Aryan language who had migrated into the northwestern regions of the Indian subcontinent early in this period. The associated Vedic culture was tribal and pastoral until c. 1200 or 1100 BCE, and centred in the Punjab.
The commonly accepted period of earlier Vedic age is dated back to the second millennium BCE. After the collapse of the Indus Valley Civilisation, which ended c. 1900 BCE, groups of Indo-Aryan peoples migrated into north-western India and started to inhabit the northern Indus Valley. The Indo-Aryans were a branch of the Indo-Iranians, which--according to the most widespread hypothesis--have originated in the Andronovo culture in the Bactria-Margiana era, in present northern Afghanistan. Some writers and archaeologists have opposed the notion of a migration of Indo-Aryans into India. Edwin Bryant and Laurie Patton used the term "Indo-Aryan Controversy" for an oversight of the Indo-Aryan Migration theory, and some of its opponents. These ideas are outside the academic mainstream. Mallory and Adams note that two types of models "enjoy significant international currency" as to the Indo-European homeland, namely the Anatolian hypothesis, and a migration out of the Eurasian steppes. According to Upinder Singh, "The original homeland of the Indo-Europeans and Indo-Aryans is the subject of continuing debate among philologists, linguists, historians, archaeologists and others. The dominant view is that the Indo-Aryans came to the subcontinent as immigrants. Another view, advocated mainly by some Indian scholars, is that they were indigenous to the subcontinent." The knowledge about the Aryans comes mostly from the Rigveda-samhita, i. e. the oldest layer of the Vedas, which was composed c. 1500-1200 BCE. They brought with them their distinctive religious traditions and practices. The Vedic beliefs and practices of the pre-classical era were closely related to the hypothesised Proto-Indo-European religion, and the Indo-Iranian religion. According to Anthony, the Old Indic religion probably emerged among Indo-European immigrants in the contact zone between the Zeravshan River (present-day Uzbekistan) and (present-day) Iran. It was "a syncretic mixture of old Central Asian and new Indo-European elements", which borrowed "distinctive religious beliefs and practices" from the Bactria-Margiana Culture.

What were the people like in the beginning?
The Vedic beliefs and practices of the pre-classical era were closely related to the hypothesised Proto-Indo-European religion, and the Indo-Iranian religion.