le Fauve (the Wild Beast): Henri Matisse "The Green Line"

Henri Matisse. Portrait of Madame Matisse. (The green line). 1905. 40.50 x 32.5 cm. Oil and tempera on canvas. Statens Museum for Kunst.

Fauvism is the style of les Fauves (French for "the Wild Beasts"), a loose group of early twentieth-century Modern artists whose works emphasized painterly qualities and strong color over the representational or realistic values retained by Impressionism. 

While Fauvism as a style began around 1900 and continued beyond 1910, the movement as such lasted only a few years, 1904–1908, and had three exhibitions. The leaders of the movement were Henri Matisse and André Derain.