Question: What is the date of death of Empress Xin's husband?
Sentence (from "Shi Siming"): Shi Siming (史思明) (703 – 18 April 761), or Shi Sugan (史窣干), was a general of the Chinese Tang Dynasty who followed his childhood friend An Lushan in rebelling against Tang, and who later succeeded An Lushan's son An Qingxu as emperor of the Yan state that An Lushan established.
Relevant evidence: Yes