Prince
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In a general sense, a sovereign; the ruler of a nation or state. More particularly, the son of a king or emperor or the issue of a royal family; as princes of the blood. The chief of any body of men. Webster.
— Prince of Wales. The eldest son of the English sovereign. He is the heir-apparent to the crown.