King Willem III’s Reign
The holiday was created in 1885 to celebrate the 5th birthday of Princess Wilhelmina, heir to the throne. King Willem III wasn’t super popular then, so they thought celebrating the heir’s birthday would be good. The holiday was called Prinsessedag (Princess’s Day) and was celebrated on August 31st, Princess Wilhelmina’s Birthday.
Queen Wilhelmina’s Reign (1890 to 1948)
During Queen Wilhelmina’s reign the holiday was renamed Koninginnedag (Queen’s Day) and became the Monarch’s Official Birthday Celebration. The holiday continued to be celebrated on August 31st, Wilhelmina’s birthday.
Wilhelmina became Queen at age 10, so she had no heir at the time for the tradition of Princess’s (or Prince’s) Day to continue.
Queen Juliana’s Reign

Ron Kroon / Anefo, CC0, via Wikimedia Commons
Queen Juliana moved Koninginnedag (Queen’s Day) to her own birthday, April 30th. Juliana marked the day by receiving a floral parade at Soestdijk Palace, a tradition already started from when she was a Princess. Originally the floral parade was started at Soestdijk Palace to mark her grandmother, Queen (Consort) Emma’s Birthday.






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