Question: What is the date of death of Wang Yacheng's father?
Sentence (from "Wang Yanxi"): Wang Yanxi (王延羲) (died April 8, 944), known as Wang Xi (王曦) during his reign, formally Emperor Jingzong of Min (閩景宗), was an emperor of the Chinese Five Dynasties and Ten Kingdoms Period state Min.
Relevant evidence: Yes