He is very clever.
He made great contributions to the collation and preservation of ancient books, which were very important in the wartime Song Dynasty.
He was a monarch, perhaps like Chongzhen, but even when he died, he was buried as a monarch.
Four histories recorded that he was a heavy pupil and Shun was also a heavy pupil, which may be the reason.
Five TV programs Zhao Kuangyin and he are friends.
Add a few points in favor of personal ideas!