Infanta Cristina, the youngest daughter of King Juan Carlos of Spain, has been summoned to appear in court over accusations of fraud and money-laundering.
The 48-year-old Spanish princess has been linked to the business affairs of her husband, Inaki Urdangarin, who is being investigated for alleged embezzlement.
Infanta Cristina, Duchess of Palma de Mallorca, is now a formal suspect and should appear in court on March 8.
It is believed to be the first time a direct relative of the king will appear in court accused of wrongdoing.