Question: What is the date of death of Hsinbyumashin's mother?
Sentence (from "Hsinbyumashin"): She was orchestrated the massacre of upward of 100 members of the royal family, it was an edict by Hsinbyumashin that ordered almost all possible heirs to the throne be killed, so that her daughter Supayalat and son-in-law Thibaw Min would become queen and king.
Relevant evidence: No