Question: What is the date of death of Infanta Marie Anne Of Portugal's husband?
Sentence (from "Infanta Marie Anne of Portugal"): Infanta Marie Anne of Portugal (13 July 1861 – 31 July 1942) was Grand Duchess of Luxembourg as the wife of Grand Duke Guillaume IV and the country's regent in the name of their daughter, Grand Duchess Marie-Adélaïde.
Relevant evidence: Yes