King Billy's white steed is more fiction than fact
Car maker Henry Ford famously described history as bunkum - a jaundiced view but with more than a grain of truth in it. So it is always fun to see what we regard as the truth of our past debunked.
Historian Lucy Worsley in a new BBC series attempts to separate fact from mythology in the people and events which played a seminal role in the development of modern society. First to be examined is King William.
The mural painters will have to go back to the drawing board as he never rode the white horse of popular imagery. That would have made him an easy target in battle. But it was all part of his propaganda war which still rages today.