Question: What is the date of death of Hafsa Hatun's husband?
Sentence (from "Bayezid I"): He decisively defeated the Crusaders at Nicopolis (in modern Bulgaria) in 1396, and was himself defeated and captured by Timur at the Battle of Ankara in 1402 and died in captivity in March 1403, triggering the Ottoman Interregnum.
Relevant evidence: No