Title: Let them eat cake
Content:   "Let them eat cake" is the traditional translation of the French phrase "Qu'ils mangent de la brioche", said to have been spoken in the 17th or 18th century by "a great princess" upon being told that the peasants had no bread. The French phrase mentions brioche, a bread enriched with butter and eggs, considered a luxury food. The quote is taken to reflect either the princess's frivolous disregard for the starving peasants or her poor understanding of their plight. While the phrase is commonly attributed to Marie Antoinette, prior to the French Revolution, she did not originate it, and she probably never said it.
Title: Let them eat cake
Content:  The phrase was supposedly said by Marie Antoinette in 1789, during one of the famines in France during the reign of her husband, King Louis XVI. But it was not attributed to her until half a century later. Although anti-monarchists never cited the anecdote during the French Revolution, it acquired great symbolic importance in subsequent historical accounts when pro-revolutionary commentators employed the phrase to denounce the upper classes of the Ancien Régime as oblivious and rapacious. As one biographer of the Queen notes, it was a particularly powerful phrase because "the staple food of the French peasantry and the working class was bread, absorbing 50 percent of their 
Title: French fashion
Content:  of class conflict, western aristocracy and absolutism government in addition to being frivolous, superficial; and have attributed the start of the French Revolution. The phrase "Let them eat cake" is often attributed to Marie Antoinette, but there is no evidence she ever uttered it, and it is now generally regarded as a "journalistic cliché". It may have been a rumor started by angry French peasants as a form of libel. This phrase originally appeared in Book VI of the first part (finished in 1767, published in 1782) of Rousseau's putative autobiographical work, Les Confessions: "Enfin je me rappelai le pis-aller d'une grande princesse à qui l'on disait que les paysans n'avaient pas de pain, et qui répondit: 
Title: Marie Antoinette
Content:  The phrase "Let them eat cake" is often attributed to Marie Antoinette, but there is no evidence that she ever uttered it, and it is now generally regarded as a journalistic cliché. This phrase originally appeared in Book VI of the first part of Jean-Jacques Rousseau's autobiographical work Les Confessions, finished in 1767 and published in 1782: "Enfin Je me rappelai le pis-aller d'une grande Princesse à qui l'on disait que les paysans n'avaient pas de pain, et qui répondit: Qu'ils mangent de la brioche" ("Finally I recalled the stopgap solution of a great princess who was told that the peasants 
Title: Let them eat cake
Content:  Another hypothesis is that after the revolution, the phrase, which was initially attributed to a great variety of princesses of the French royal family, eventually stuck on Marie Antoinette because she was in effect the last and best-remembered "great princess" of Versailles. The myth had also been previously attributed to two of Louis XV’s daughters: Madame Sophie and Madame Victoire. In his 1853 novel Ange Pitou, Alexandre Dumas attributes the quote to one of Marie Antoinette's favourites, the Duchess of Polignac.
Title: You can't have your cake and eat it
Content:  An early recording of the phrase is in a letter on 14 March 1538 from Thomas, Duke of Norfolk, to Thomas Cromwell, as "a man can not have his cake and eat his cake". The phrase occurs with the clauses reversed in John Heywood's A dialogue Conteinyng the Nomber in Effect of All the Prouerbes in the Englishe Tongue from 1546, as "wolde you bothe eate your cake, and have your cake?". In John Davies's Scourge of Folly of 1611, the same order is used, as "A man cannot eat his cake and haue it stil." In Jonathan Swift's 1738 farce "Polite Conversation", the character Lady Answerall says "she cannot eat her cake and have her cake". The order was 
Title: You can't have your cake and eat it
Content:  in a posthumous adaptation of "Polite Conversation" in 1749 called "Tittle Tattle; or, Taste A-la-Mode", as "And she cannot have her Cake and eat her Cake". A modern-sounding variant from 1812, "We cannot have our cake and eat it too", can be found in R. C. Knopf's Document Transcriptions of the War of 1812 (1959). According to Google Ngram Viewer, a search engine that charts the frequencies of phrases throughout the decades, the eat-have order used to be the most common variant (at least in written form) before being surpassed by the have-eat version in the 1930s and 40s. In 1996, the eat-have variant played a role in the apprehension of the Unabomber, whose real name is Ted Kaczynski. 
Title: Let them eat cake
Content: a.In an earlier 1841 volume of Les Guêpes, a slightly different version of the famous phrase was quoted: "S’il n’y a pas de pain on mangera de la brioche". 
Title: Let them eat cake
Content:  The phrase appears in book six of Jean-Jacques Rousseau's Confessions, whose first six books were written in 1765 and published in 1782. In the book, Rousseau recounts an episode in which he was seeking bread to accompany some wine he had stolen. Feeling too elegantly dressed to go into an ordinary bakery, he recalled the words of a "great princess": "At length I remembered the last resort of a great princess who, when told that the peasants had no bread, replied: "Then let them eat brioches."" - Jean-Jacques Rousseau Rousseau does not name the "great princess", and he may have invented the anecdote, as the Confessions is not considered entirely factual.
Title: Let Them Eat Cake (TV series)
Content:  Let Them Eat Cake is a British sitcom that aired on BBC One in 1999. Starring Dawn French and Jennifer Saunders, it is one of the few programmes in which French and Saunders have both appeared which they did not create themselves.

Question: who coined the phrase let them eat cake?
Answer: Jean-Jacques Rousseau.