The phrase is commonly traced to Jean-Jacques Rousseau’s *Confessions*, where it’s attributed to an unnamed “great princess,” not Marie Antoinette. Encyclopaedia Britannica notes the first printed attribution to Marie Antoinette appeared only in 1843, decades after the phrase was already in circulation.
The line popularly rendered as “Let them eat cake” reflects the French “Qu’ils mangent de la brioche” (“Let them eat brioche”). According to Encyclopaedia Britannica and HistoryExtra, there is no contemporaneous record of Marie Antoinette saying it; instead, versions of the sentiment existed earlier and were later pinned on her as a symbol of aristocratic indifference.
A key early appearance is in Jean-Jacques Rousseau’s Confessions (written before the French Revolution), which mentions an unnamed “great princess” responding to bread shortages by suggesting brioche. Britannica also reports that the quote was not attributed to Marie Antoinette in print until 1843—about 50 years after her execution—supporting historians’ view (also echoed by Live Science) that the association with her is propaganda rather than documented history.