Analysis of information sources in references of the Wikipedia article "Malacca thuộc Bồ Đào Nha" in Vietnamese language version.
The Portuguese spent several years trying to establish formal relations with China, but Melaka had been part of the Chinese tributary system, and the Chinese had found out about the Portuguese attack, making them suspicious. The embassy was formally rejected in 1521.
envoy, had most effectively poured out his tale of woe, of deprivation at the hands of the Portuguese in Malacca; and he had backed up the tale with others concerning the reprehensible Portuguese methods in the Moluccas, making the case (quite truthfully) that European trading visits were no more than the prelude to annexation of territory. With the tiny sea power at this time available to the Chinese
Pires came as an ambassador to Beijing to negotiate trade terms and settlements with China. He did make it to Beijing, but the mission failed because first, while Pires was in Beijing, the dethroned Sultan of Malacca also sent an envoy to Beijing to complain to the emperor about the Portuguese attack and conquest of Malacca. Malacca was part of China's suzerainty when the Portuguese took it. The Chinese were apparently not happy with what the Portuguese did there.
in China was far from friendly; this, it seems, had something to do with the complaint which the ruler of Malacca, conquered by the Portuguese in 1511, had lodged with the Chinese emperor, his suzerain.
In 1511... Alboquerque himself sailed... to attack Malacca... The Sultan of Malacca fled down the coast, to establish himself in the marshes of Johore, whence he sent petitions for redress to his remote suzerain, the Chinese Emperor. These petitions later caused the Portuguese, in their efforts to gain admission to trade at Canton, a great deal of trouble
When the Portuguese tried to penetrate, in their own ships, to Canton itself, their reception by the Chinese authorities—understandably, in view of their reputation at Malacca—was unwelcoming, and several decades elapsed before they secured a tolerated toehold at Macao.
The inexusable behavior of the Portuguese, combined with the ill-chosen language of the letters which Pires presented to the celestial emperor, supplemented by a warning from the Malay sultan of Bintan, persuaded the Chinese that Pires was indeed up to no good
The Moslem ruler of Malacca, whom they had dispossessed, complained of them to the Chinese authorities. A Portuguese envoy, Pires, who reached Peking in 1520 was treated as a spy, was conveyed by imperial order to Canton
