Question: When did Zheng Kezang's father die?
Sentence (from "Zheng Jing"): Zheng Jing, Prince of Yanping (25 October 1642 – 17 March 1681), courtesy names Xianzhi (賢之) and Yuanzhi (元之), pseudonym Shitian (式天), was a 17th-century Chinese warlord, Ming dynasty loyalist and ruler of the Kingdom of Tungning in Taiwan.
Relevant evidence: Yes