Spain's Crown Princess Leonor turns 18 and is feted as the future queen at a swearing-in ceremony

Princess Leonor, center, receives the applause of Spanish King Felipe VI, Queen Letizia and her sister Sofia, right, after swearing allegiance to the Constitution during a gala event that makes her eligible to be queen one day, in Madrid on Tuesday, Oct. 31 2023. The heir to the Spanish throne, Princess Leonor, is to swear allegiance to the Constitution on her 18th birthday Tuesday, in a gala event that paves the way to her becoming queen when the time comes. Leonor is the eldest daughter of King Felipe and Queen Letizia. (AP Photo/Manu Fernandez)

MADRID (AP) — The heir to the Spanish throne, Princess Leonor, swore allegiance to her country's Constitution on her 18th birthday at a gala event on Tuesday that laid the groundwork for her eventual succession as queen when the time comes.

The nationally televised ceremony in the lower house of Parliament is understood to symbolize the continuity of Spain's parliamentary monarchy and the institution’s allegiance to the chamber.

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