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Although the superintendent of the Imperial Astronomical Bureau is the second most powerful figure in the Great Xia's Imperial Court, it would not be possible for him to falsely accuse a prince with potential to contend for the throne; this must certainly have involved Emperor Xia's approval.
At that time, all the ministers and nobles harbored doubts, wondering why Emperor Xia would target the Fifth Prince, and even sub rosa, many conspiracy theories of fratricidal intrigue spread.
However, today, after the involvement of the Supreme Taoist in many incidents of the Southern Three Provinces was confirmed, all the ministers and nobles finally realized that Emperor Xia's action against the Fifth Prince might very well be related to the Supreme Taoist.