heir to a throne
Formal term for a person in line to succeed a monarch. Used in historical, political, or fantasy contexts.
If the heir to the throne is not decided, the country becomes unstable.
He was raised as the heir to the throne.
Compound of 王位 (throne) + 継承 (succession) + 者 (person). The exact historical derivation is uncertain, but the components are standard Sino-Japanese morphemes.