The grand Syon House with its iconic Robert Adam-designed interior is in Isleworth, Hounslow, west London. It is the seat of the Earl of Northumberland and is the only ducal seat in London. In the 18th and 19th centuries, when the royal family regularly spent time in nearby Kew, Isleworth became very fashionable and a large number of grand houses were built here, including the still-standing Kendal House, Gumley House, and Shrewsbury House. Spring Grove House, former home to Andrew Pears of Pears soap fame and built by the great botanist Sir Joseph Banks, is in Isleworth. The painter Vincent Van Gogh once lived in Isleworth and it is the birthplace of David Attenborough.
Although Isleworth was built along the Thames, the boundaries of the area changed in 1994, reducing its waterfront acreage.