Dauphin
No. He was the heir presumptive to the Austro-Hungarian throne; he had nothing to do with the German government.
The heir to the throne in the UK is Charles The Prince of Wales.
There is a direct heir to the throne Prince Charles the Prince of Wales.
He was heir to the throne
The Dauphin (male) or Dauphine (female). France, however, adhered to the Salic Law, so no female could inherit the throne; La Dauphine was the wife of the Dauphin. The word Dauphin, incidentally, means Dolphin. I suspect this raises another question.
Dauphin
Prince Charles is heir apparent to Queen Elizabeth II.
The heir of the French throne, always a male as women were not allowed to reign in their own name, was called "le Dauphin". The name stems from the region of Dauphiné, a south-eastern province of France centered around Grenoble.
He is the eldest son of the reigning monarch.
Archduke of Austria and Heir-apparent to the Austro-Hungarian throne.
Heir Apparent means that you are the next in line for the an inheritance, and that the birth of another heir cannot supersede your claim. You could use it in a sentence like this: He was the heir apparent to the throne. Read the book literally called "Heir Apparent" if you want a good story of a definition =)
The heir apparent to the throne of The United Kingdom is Prince Charles.
When a prince or princess who is first in line to the throne, they are called the Heir-Apparent. In example, HRH The Prince of Wales is the Heir-Apparent to the throne of England. When they ascend to the throne, they're called the Monarch. When a King marries a woman, she is not only called the queen, she is called the Heir Consort to the King, and likewise.
The heir apparent to the throne of The United Kingdom is Prince Charles.
Prince Charles in next in line to throne. Then it will be Prince William, and then it will be Prince George.
"Crown Prince" or "Crown Princess".
Charles, son of Queen Elizabeth II was Duke of Cornwall and Heir Presumptive as a child. In 1958 he was named Prince of Wales but this was not formalised until 1969, at his Investiture at Caernarfon Castle when he became formally the Heir Apparent to the throne.