Question: When did Li Ying (Prince)'s father die?
Sentence (from "Emperor Xuanzong of Tang"): Emperor Xuanzong of Tang (8 September 685 – 3 May 762), also commonly known as Emperor Ming of Tang or Illustrious August, personal name Li Longji, also known as Wu Longji  from 690 to 705, was the seventh emperor of the Tang dynasty in China, reigning from 713 to 756 CE.
Relevant evidence: Yes