Question: What is the date of death of Marie Von Brühl's husband?
Sentence (from "Marie von Flotow"): She served for a period in the household of Louise of Hesse- Kassel, before she was employed in the household of Louise's daughter Maria Feodorovna( Dagmar of Denmark), who married the future tsar Alexander III of Russia in 1866 and became empress in 1881.
Relevant evidence: No