Question: What is the date of birth of Empress Dowager Xiaochun's husband?
Sentence (from "Empress Dowager Xiaochun"): Empress Dowager Xiaochun (9 October 1593 – 28 August 1614), surnamed Liu, was a Ming Dynasty concubine of the Taichang Emperor and biological mother of the Chongzhen Emperor.
Relevant evidence: Yes