Question: What is the date of death of Beatrice Of Swabia's husband?
Sentence (from "Beatrice of Swabia"): Beatrice or Beatrix of Swabia (April/June 1198 – 11 August 1212), a member of the Hohenstaufen dynasty, was Holy Roman Empress and German Queen in 1212 as the first wife of the Welf emperor Otto IV.
Relevant evidence: Yes