Wilhelmus
Wilhelmus van Nassouwe, usually known just as the Wilhelmus (Dutch: het Wilhelmus pronunciation; English translation: the William), is the national anthem of the Netherlands and is the oldest national anthem in the world though the words of the Japanese national anthem (not the music) date back to the ninth century. Although it was not recognized as the official national anthem until 1932, it has always been popular with parts of the Dutch population and resurfaced on several occasions in the course of Dutch history before gaining its present status.
Read more about Wilhelmus.