Question: When did Bùi Thị Nhạn's husband die?
Sentence (from "Nguyễn Huệ"): Nguyễn Huệ , also known as Nguyễn Quang Bình  or Emperor Quang Trung (1753 – 16 September 1792), was the second emperor of the Tây Sơn dynasty, reigning from 1788 until 1792.
Relevant evidence: Yes