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King Willem-Alexander of the Netherlands wears a cattleman's hat before giving a speech at the Rabobank Farm2Fork summit at Cockatoo Island in Sydney on November 3, 2016. The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia. / AFP / SAEED KHAN (Photo credit should read SAEED KHAN/AFP/Getty Images)

King Willem-Alexander of the Netherlands wears a cattleman's hat before giving a speech at the Rabobank Farm2Fork summit at Cockatoo Island in Sydney on November 3, 2016. 
The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia. / AFP / SAEED KHAN        (Photo credit should read SAEED KHAN/AFP/Getty Images)