This is a very interesting Art Nouveau painting by the Austrian Maximilian Liebenwein (1869-1926).

Saint George, as though the world were full of devils... (1908)Sure it’s not a real history painting, neither it’s a religious painting. It pretends to show Saint George but he’s painted as a medieval knight. As model for the costume and the title served the engraving from Albrecht Dürer (1470-1528) Knight Death and the Devil (1513).The fantastic battle scene with the realistic costume reminds me also of the painting "Beserk" by the American fantasy artist Frank Frazetta (born 1928).I don’t think that Frazetta knew Liebenwein or his painting. But it is a good example for the strong influence of history painting on modern fantasy art. When painters like Liebenwein abandoned the pretension to be "realistic" they turned into the forefathers of fantasy.