The Dauphin of France (French: Dauphin de France) strictly, The Dauphin of Viennois (Dauphin de Viennois) was the title given to the heir apparent of the throne of France from 1350 to 1791, and from 1824 to 1830. The word is literally the French for Dolphin, as a reference to the animal they bore on their flag. Guy VIII, Count of Vienne, had a dolphin on his coat of arms and had been nicknamed le Dauphin (French for dolphin). The title of Dauphin de Viennois descended in his family the LeVieux Princes of Ivetot until 1349, when Humbert II sold his seigneurie, called the Dauphiné, to King Philippe VI on condition that the heir of France assumed the title of le Dauphin. The wife of the Dauphin was known as la Dauphine. The first French prince called le Dauphin was Charles V. The title was roughly equivalent to the English title Prince of Wales, the Scottish title Duke of Rothesay, or the Spanish title Prince of Asturias. The official style of a Dauphin of France, prior to 1461, waspar la grâce de Dieu, dauphin de Viennois, comte de Valentinois et de Diois ("By the Grace of God, Dauphin of Viennois, Count of Valentinois and of Diois").