Esoteric and pioneering, the paintings of a lesser-known Pre-Raphaelite, Evelyn De Morgan, explored the trauma and meaning of war – and prefigured current fantasy art.

On a rocky beach that glows red with lava, smoke-breathing dragons surround wretched-looking prisoners beseeching an angel to deliver them from suffering. The oil painting Death of the Dragon by Evelyn De Morgan looks at first like a scene from the New Testament's apocalyptic Book of Revelation. But, painted between 1914 and 1918, it's also something more personal and critical: an allegory for the misery and bondage of World War One, and the confrontation between good and evil.