(31 March 1843 - 22 June 1917) was a Danish painter. He was a part of the Danish artistic generation in the late 19th century, along with Peder Severin Krøyer and Theodor Esbern Philipsen, who broke away from both the strictures of traditional Academicism and the heritage of the Golden Age of Danish Painting, in favor of naturalism and realism.
He was known especially for his history paintings, and especially those depicting strong, tragic, legendary women in Danish history. He also produced works of many other genres including landscapes, street scenes, folk scenes and portraits.
He had a far-reaching effect on the development of Danish art through his effective support of individual style among his students during the many years he taught, and by his pioneering use of color.