Question: When did Nino, Princess Of Mingrelia's husband die?
Sentence (from "Nino, Princess of Mingrelia"): After the death of her husband in 1804, Nino was a regent for her underage son, Levan until 1811, and helped bring Mingrelia and Abkhazia, a neighboring principality of her in-laws, under the hegemony of the Russian Empire.
Relevant evidence: No