Hongxi Emperor
Other economic exploitation involved grain taxes, annual levies of lacquer, sappanwood, kingfisher feathers, fans and aromatics, and the imposition of monopolies on gold, silver, salt, iron, and fish. In addition, eunuchs were sent to Jiaozhi with the task of collecting treasure for the Emperor, but an equal amount of treasure collection appears to have been done for themselves. The rapaciousness of the eunuchs, at least as depicted in Ming accounts, was such that even the emperors intervened in appointments. The Hongxi Emperor objected to the re-sending of the eunuch Ma Qi to Annam, when he attempted to have himself reappointed to control the gold, silver, aromatics and pearls of the region in 1424.