An indifference to history, including biography, politics and geography, is the great defect of Indian literature. Not only are there few historical treatises[107] but even historical allusions are rare and this curious vagueness is not peculiar to any age or district. It is as noticeable among the Dravidians of the south as among the speakers of Aryan languages in the north. It prevails from Vedic times until the Mohammedan conquest, which produced chronicles though it did not induce Brahmans to write them in Sanskrit. The lacuna is being slowly filled up by the labours of European scholars who have collected numerous data from an examination of inscriptions, monuments and coins, from the critical study of Hindu literature, and from research in foreign, especially Chinese, accounts of ancient India. At first sight the history of India seems merely a record of invasions, the annals of a land that was always receptive and fated to be conquered. The coast is poor in ports and the nearest foreign shore distant. The land frontiers offer more temptation to invaders than to emigrants. The Vedic Aryans, Persians, Greeks and hordes innumerable from Central Asia poured in century after century through the passes of the north-western mountains and after the arrival of Vasco da Gama other hordes came from Europe by sea. But the armies and fleets of India can tell no similar story of foreign victories. This picture however neglects the fact that large parts of Indo-China and the Malay Archipelago (including Camboja, Champa, Java and even Borneo) received not only civilization but colonists and rulers from India. In the north too Nepal, Kashmir, Khotan and many other districts might at one time or another be legitimately described as conquered or tributary countries. It may indeed be justly objected that Indian literature knows nothing of Camboja and other lands where Indian buildings have been discovered[108] and that the people of India were unconscious of having conquered them. But Indian literature is equally unconscious of the conquests made by Alexander, Kanishka and many others. Poets and philosophers were little interested in the expeditions of princes, whether native or foreign. But if by India is meant the country bounded by the sea and northern mountains it undoubtedly sent armies and colonists to regions far beyond these limits, both in the south-east and the north, and if the expansion of a country is to be measured not merely by territorial acquisition but by the diffusion of its institutions, religion, art and literature, then "the conquests of the Dhamma," to use Asoka's phrase, include China, Japan, Tibet and Mongolia.