Marie Antoinette never said 'Let them eat cake'.
The line, originally 'Let them eat brioche', appears in Jean-Jacques Rousseau's 'Confessions', written around 1765, when Marie Antoinette was nine years old and living in Vienna. Rousseau attributes it to an unnamed 'great princess'. The saying was only attached to the queen decades after her execution in 1793.
Useful: Famous quotes migrate to famous people. Check the date before you pass one on.
Source: en.wikipedia.org