Question: When did Princess Marie Of Schwarzburg-Rudolstadt's husband die?
Sentence (from "Frederick Francis II, Grand Duke of Mecklenburg-Schwerin"): Frederick Francis II (28 February 1823 – 15 April 1883) was a Prussian officer and Grand Duke of Mecklenburg-Schwerin from 7 March 1842 until 15 April 1883.
Relevant evidence: Yes