Question: When did Margaret Of Opava's husband die?
Sentence (from "John Henry, Margrave of Moravia"): John Henry of Luxembourg (12 February 1322 – 12 November 1375), a member of the House of Luxembourg, was Count of Tyrol from 1335 to 1341 and Margrave of Moravia from 1349 until his death.
Relevant evidence: Yes