Willem de Vlamingh (b1640) was a Dutch sea-captain with the VOC (Dutch East India Company)who explored the south west coast of Australia (then “New Holland”) in the late 17th century.
On 10 January 1697, he ventured up the Swan River. He and his crew are believed to have been the first Europeans to do so. He named the Swan River (Zwaanenrivier in Dutch) after the large numbers of black swans that he observed there.
There is now a large sundial which commemorates the approximate position of where he reached. It is just below the Wheel of Perth and I was able to get a shot of it.