They are descendants of Zoroastrians who fled to India from Muslim persecution during the 7/8th centuries
It was the Zoroastrians that migrated from Persia to India during the 8th century. They did this to get away from religious persecution by the Muslims.
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S. H. Jhabvala has written: 'A brief history of Parsees' -- subject(s): Parsees
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parsees
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Today's Parsees, who follow the Zoroastrian religion of its founder Zarathustra.
He was a religious leader who preached Ahura Mazda - the origins of today's Zoroastrians/Parsees.
Nanabhoy F. Mama has written: 'A Mazdaznan mystic' -- subject(s): Biography, Zoroastrians, Parsees
India is a mainly Hindu country, but there are lots of non-Hindus in India as well, including Muslims, Christians, Jains, Buddhists, Sikhs, and Parsees.
Indian is not an Islam nation. 80% of the populations are Hindus, 10% is Muslims, and the remaining 10% is christian, Buddhist, jainist, sikhs, parsees etc.