William Ewart (British politician)
Blue Plaque on Hampton Library to William Ewart, Hampton, London
William Ewart (1 May 1798 – 23 January 1869) was a British politician. In 1863, Ewart conceived the idea of a blue plaque to commemorate a link between a location and a famous person or event, serving as a historical marker. It is the oldest such scheme in the world.