In the last century and in the first decades of the present century the historians of India laid stress on the isolation of the subcontinent by the mountains and seas surrounding her on all sides and cutting her off as a separate universe. The progress of modern research has shown how mistaken this view was. We now see the true facts much more clearly than ever. The mountain barriers, though formidable at many points, are broken by gaps which have always allowed a considerable intercourse across the frontiers on the northwest as well as the northeast and at some points due north as well. By her position in the center of the littoral of the Indian Ocean, India enjoyed ample facilities for communication by sea with the countries lying to her west and east, and we now know that she and her neighbors availed themselves of these facilities from time immemorial. The Indian Ocean was navigated freely from very early, even prehistoric, times, and there was a series of lively maritime exchanges—migratory, commercial, and cultural—among the peoples of Africa, India, and Indonesia, or more generally Southeast Asia. Western Asia and the lands adjoining the Levant also took, from the beginning, a prominent part in this commerce of goods and ideas between India and the world. It is the aim of this paper to trace briefly the ancient contacts between India and the Western countries to the time when the rise and spread of Islam and the Islamic impact on India ushered in a new epoch.