Till the beginning of the 20th century, it was believed that Indian history began with the Vedic period. But this myth was shattered with the discovery of Harappa city by Dayaram Sahni in 1921 and Mohenjo-Daro city by Rakhal Das Banerjee in 1922. The discovery of these sites proved that a developed civilization existed 3000 years ago in India near the Indus Valley, which is one of the oldest civilizations not only in India but in the whole world.