Murder of Thomas Becket in Canterbury Cathedral

The Murder of Thomas Becket in Canterbury Cathedral depicted by Opie reflects the period's intense engagement with British medieval history as a source of dramatic subject matter. Becket's assassination in 1170 — ordered, tradition holds, by Henry II — was one of the most famous episodes of medieval English history and had been a subject for painters and dramatists throughout the early modern period. Canterbury Museums and Galleries holds this work in the city most closely associated with Becket's martyrdom and the subsequent cult that made Canterbury Cathedral one of the great pilgrimage destinations of medieval Europe. Opie's choice of this subject reflects his ambitions as a history painter alongside his portrait practice — the Royal Academy hierarchy placed history painting above portraiture, and artists of ambition sought to demonstrate their capabilities in both genres.

History painting demanded compositional complexity — multiple figures, dramatic action, and architectural setting — quite different from portrait work. Opie's Caravaggesque lighting is particularly suited to a violent nocturnal subject: the knights' armour and the cathedral's stone interior create strong contrasts of light and shadow that dramatise the narrative moment. The figures would be arranged to direct the eye toward the moment of the fatal blow.