King Felipe tested positive for COVID-19 this week, the Spanish Royal Household said, according to media outlets.
His Majesty is isolating and should be able to retake his agenda next week, officials said. He is said to have minor symptoms.
The King met with military officers at the Madrid Royal Palace on Tuesday. Today Queen Letizia visited a hospital.
British Prince Charles and Danish Queen Margarethe are two other major royals who have tested positive in recent days.