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The original was posted on /r/todayilearned by /u/Confident_Remote_521 on 2025-03-14 06:37:08+00:00.

Original Title: TIL Emperor Yao Chang of 4th century China had killed the emperor he had formerly served. Later he felt the late emperor’s spirit was aiding his avenging army, and made a shrine for the emperor he himself killed, asking for bygones be bygones and to protect him from his avenging troops.