The Constitution of 1791 reserved the title of Prince Royal to the heir to the throne, and that of prince français to all those formerly called "princes du sang".
In Portugal the heir apparent to the throne had the title of Prince Royal from the reign of King Edward (143338).
Definition of Prince Royal in US English:
Prince Royal
noun
The eldest son of a reigning monarch.
Example sentencesExamples
The Constitution of 1791 reserved the title of Prince Royal to the heir to the throne, and that of prince français to all those formerly called "princes du sang".
In Portugal the heir apparent to the throne had the title of Prince Royal from the reign of King Edward (143338).