Question: Why did Princess Stéphanie Of Monaco's mother die?
Sentence (from "Princess Charlotte, Duchess of Valentinois"): Princess Charlotte of Monaco, Duchess of Valentinois( Charlotte Louise Juliette Grimaldi; 30 September 1898 – 15 November 1977), was the daughter of Louis II, Prince of Monaco, and the mother of Rainier III, Prince of Monaco.
Relevant evidence: No