The Short Version
This claim is false. There is no historical evidence that Marie Antoinette ever said "Let them eat cake." The phrase predates her, appearing in Rousseau's *Confessions* (written 1765–1769) attributed to an unnamed princess when Marie Antoinette was still a child in Austria. The first printed attribution to her appeared only in 1843 — fifty years after her execution. Multiple authoritative sources confirm the quote is a myth rooted in political propaganda, not a documented historical event.