(L-R) Dutch King Willem-Alexander, Queen Maxima, Princess Laurentien and Prince Constantijn wave to the crowd from the balcony of the Palace Noordeinde in The Hague on September 20, 2016. 
Prince's Day is the traditional opening of the Dutch parliamentary year, when the King delivers the 'Speech from the Throne' in the Ridderzaal (Knights' Hall).  / AFP / ANP / Koen van Weel / Netherlands OUT        (Photo credit should read KOEN VAN WEEL/AFP/Getty Images)