Question: What is the date of death of Li Hong's mother?
Sentence (from "Li Hong"): Li Hong  (652 – 25 May 675), formally Emperor Xiaojing (孝敬皇帝, literally, "the filial and respectful emperor") with the temple name of Yizong (義宗), was a crown prince (not emperor, despite his formal title) of the Chinese dynasty Tang Dynasty.
Relevant evidence: No