Conversation so far:
What is Zheng He's relationship with Imperial China?
Imperial officials minimized the importance of Zheng.
What did he do?
The information in the Yongle and Xuande Emperors' official annals was incomplete and even erroneous.

Question: How did Imperial China minize the importance of Zheng?
Self-contained rewrite: How did Imperial China minize the importance of Zheng?