This term originated from the Dauphiné region in southeastern France, where the local counts were known as "dauphins" due to their association with a dolphin, the region's emblem.
When the Dauphiné was incorporated into the French crown in the 14th century, the title of "Dauphin of Viennois" became synonymous with the heir apparent to the French throne.
While the title is no longer used in modern France, it remains a significant part of French history and royal tradition.