Who named The Green Line Madame Matisse?

The Green Line, a famous painting by Henri Matisse, was named by art dealer and critic Louis Vauxcelles. He coined the term after noticing the bold, contrasting colors and the distinctive green line that delineated the subject's features in the portrait of Matisse's wife, Amélie. This name has since become synonymous with the artwork and the innovative style Matisse employed.