The eldest son of the king of France. Under the Valois and Bourbon dynasties, the Dauphin of France, generally shortened to Dauphin, was heir apparent to the throne of France. The title derived from the main title of the Dauphin, Dauphin of Viennois.
“… a dreadful speculative builder built this house and persuaded Austin to buy it. Oh dear, and here we are among the rich and great ; and the steel kings and copper kings and oil kings and their heirs and dauphins. Do you like the house ?”