King Felipe and Queen Letizia welcomed dozens of diplomats and world leaders in Madrid today for this year’s United Nations climate conference.

The King hosted a reception and delivered remarks at the Madrid Royal Palace’s Hall of Columns, which is reserved for deeply important events.

Among the King’s guests was U.S. House Speaker Nancy Pelosi. The royals greeted her warmly.

The King is also set to attend the conference’s closing ceremonies later this month.