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Remnants of civilization in the greater Bengal region date back four thousand years,[11] when the region was settled by Dravidian, Tibeto-Burman, and Austro-Asiatic peoples. The exact origin of the word "Bangla" or "Bengal" is not known, though it is believed to be derived from Bang, the Dravidian-speaking tribe that settled in the area around the year 1000 BCE.[12]
The kingdom of Gangaridai was formed from at least the 7th century BCE, which later united with Bihar under the Magadha, Nanda, Mauryan and Sunga Empires. Bengal was later part of the Gupta Empire and Harsha Empire from the 3rd to the 6th centuries CE. Following its collapse, a dynamic Bengali named Shashanka founded an impressive short-lived kingdom. After a period of anarchy, the Bengali Buddhist Pala dynasty ruled the region for four hundred years, followed by a shorter reign of the Hindu Sena dynasty. Read more here >> http://en.wikipedia.org/wiki/Bangladesh