Based on the provided names and years of birth guess which country's throne each heir is waiting to inherit. Beware that there is a difference between an heir apparent and an heir presumptive, and only officially recognized and designated heirs apparent are included in this quiz.
In Andorra, Cambodia, Malaysia, Qatar, Swaziland, and Vatican City the next monarch will be elected and therefore there is no named successor.
Oman's Sultan Qaboos has no children and has not publicly named his heir. The name of his successor is a closely guarded state secret.
Spain's heir presumptive is Leonor, Princess of Asturias (born 2005). King Felipe currently has no sons, but under current Spanish primogeniture laws, if he has a son he will become the heir apparent, displacing his sister.
King Rama X of Thailand currently has several children, of which only his son Prince Dipangkorn Rasmijoti (born 2005) is officially recognized and is therefore the heir presumptive. Nonetheless neither the Prince nor any of the other children have been officially designated as Crown Prince.