The Indian sub-continent has a thrilling history that goes back almost 60, 000 years, based on studies using mitocondrial DNA from modern Indians (http://ces.iisc.ernet.in/hpg/cesmg/peopling.html). Since then, there have been several waves of our ancestors, founding ancient cultures that are lost to the eternal sands of time.
Language is thought to have come into being some 10,000 years ago; again, we have lost touch with the tongues spoken by our Indian ancestors of the time. Sanskrit, the most significant ancient language of the region, was brought to the Indian sub-continent in another wave of highly evolved peoples.