明仁宗
Menzies hypothesis suggests that knowledge of Zheng He's discoveries was subsequently lost because the mandarin bureaucrats of the Ming imperial court feared that the costs of further voyages would ruin the Chinese economy. He conjectures that when the Yongle Emperor died in 1424 and the new Hongxi Emperor forbade further expeditions, the mandarins hid or destroyed the records of previous exploration to discourage further voyages.