Willem Hesselsz de Vlamingh was a Dutch sea-captain who explored the central west coast of Australia (then "New Holland") in the late 17th century.
Vlamingh joined the VOC (Dutch East India Company) in 1688 and made his first voyage to Batavia in the same year. Following a second voyage, in 1694, he was asked to mount an expedition to search for the Ridderschap van Holland, a VOC capital ship that was lost with 325 passengers and crew on its way to Batavia in 1694. VOC officials believed it might have run aground on the west coast of New Holland.
On 29 December 1696, he landed on Rottnest Island. He saw numerous quokkas (a native marsupial) there, and thinking they were large rats he named the island "rats' nest" (Rattennest in Dutch) because of them.