The future queen, Princess Leonor of Spain, turns 18 and is sworn in
The King of Spain marks the main duty of the Heir, who swears to watch over “the unity and permanence of Spain”. This solemn oath reflects the deep commitment of the Heir to uphold the principles enshrined in the Constitution. As the future leader of the nation, the Heir understands the importance of preserving the unity and stability of Spain, ensuring that it remains a strong and prosperous country for generations to come.