Question: What is the date of death of Empress Dowager Bian's husband?
Sentence (from "Empress Dowager Bian"): Lady Bian (30 December 159 – 9 July 230), also known as Empress Dowager Bian or Grand Empress Dowager Bian, formally known as Empress Wuxuan, was an empress dowager and later grand empress dowager of the state of Cao Wei during the Three Kingdoms period of China.
Relevant evidence: No