Question: What is the date of death of Princess Sibylla Of Saxe-Coburg And Gotha's husband?
Sentence (from "Princess Sibylla of Saxe-Coburg and Gotha"): A member of the House of Saxe-Coburg and Gotha, Sibylla became a Swedish princess by marrying Prince Gustaf Adolf, Duke of Västerbotten, who did not live to ascend the Swedish throne.
Relevant evidence: Yes