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It is remarkable that the great island of Sumatra, which seems to lie in the way of anyone proceeding from India eastwards and is close to the Malay peninsula, should in all ages have proved less accessible to invaders coming from the west than the more distant Java. Neither Hindus, Arabs nor Europeans have been able to establish their influence there in the same thorough manner. The cause is probably to be found in its unhealthy and impenetrable jungles, but even so its relative isolation remains singular.
It does not appear that any prince ever claimed to be king of all Sumatra. For the Hindu period we have no indigenous literature and our scanty knowledge is derived from a few statues and inscriptions and from notices in Chinese writings. The latter do not refer to the island as a whole but to several states such as Indragiri near the Equator and Kandali (afterwards called San-bo-tsai, the Sabaza of the Arabs) near Palembang. The annals of the Liang dynasty say that the customs of Kandali were much the same as those of Camboja and apparently we are to understand that the country was Buddhist, for one king visited the Emperor Wu-ti in a dream, and his son addressed a letter to His Majesty eulogizing his devotion to Buddhism. Kandali is said to have sent three envoys to China between 454 and 519.
The Chinese pilgrim I-Ching[401] visited Sumatra twice, once for two months in 672 and subsequently for some years (about 688-695). He tells us that in the islands of the Southern Sea, "which are more than ten countries," Buddhism flourishes, the school almost universally followed being the Mûlasarvâstivâda, though the Sammitîyas and other schools have a few adherents. He calls the country where he sojourned and to which these statements primarily refer, Bhoja or Śrîbhoja (Fo-shih or Shih-li-fo-shih), adding that its former name was Malayu. It is conjectured that Shih-li-fo-shih is the place later known as San-bo-tsai[402] and Chinese authors seem to consider that both this place and the earlier Kandali were roughly speaking identical with Palembang. I-Ching tells us that the king of Bhoja favoured Buddhism and that there were more than a thousand priests in the city. Gold was abundant and golden flowers were offered to the Buddha. There was communication by ship with both India and China. The Hinayana, he says, was the form of Buddhism adopted "except in Malayu, where there are a few who belong to the Mahayana." This is a surprising statement, but it is impossible to suppose that an expert like I-Ching can have been wrong about what he actually saw in Śrîbhoja. So far as his remarks apply to Java they must be based on hearsay and have less authority, but the sculptures of Boroboedoer appear to show the influence of Mûlasarvâstivâdin literature. It must be remembered that this school, though nominally belonging to the Hinayana, came to be something very different from the Theravâda of Ceylon.
The Sung annals and subsequent Chinese writers know the same district (the modern Palembang) as San-bo-tsai (which may indicate either mere change of name or the rise of a new city) and say that it sent twenty-one envoys between 960 and 1178. The real object of these missions was to foster trade and there was evidently frequent intercourse between eastern Sumatra, Champa and China. Ultimately the Chinese seem to have thought that the entertainment of Sumatran diplomatists cost more than they were worth, for in 1178 the emperor ordered that they should not come to Court but present themselves in the province of Fu-kien. The Annals state that Sanskrit writing was in use at San-bo-tsai and lead us to suppose that the country was Buddhist. They mention several kings whose names or titles seem to begin with the Sanskrit word Śrî[403]. In 1003 the envoys reported that a Buddhist temple had been erected in honour of the emperor and they received a present of bells for it. Another envoy asked for dresses to be worn by Buddhist monks. The Ming annals also record missions from San-bo-tsai up to 1376, shortly after which the region was conquered by Java and the town decayed[404]. In the fourteenth century Chinese writers begin to speak of Su-mên-ta-la or Sumatra by which is meant not the whole island but a state in the northern part of it called Samudra and corresponding to Atjeh[405]. It had relations with China and the manners and customs of its inhabitants are said to be the same as in Malacca, which probably means that they were Moslims.
Little light is thrown on the history of Sumatra by indigenous or Javanese monuments. Those found testify, as might be expected, to the existence here and there of both Brahmanism and Buddhism. In 1343 a Sumatran prince named Adityavarman, who was apparently a vassal of Madjapahit, erected an image of Manjuśrî at Tjandi Djago and in 1375 one of Amoghapâśa.