(1872-1946) was a Belgian Post-Impressionist painter, who lived most of his adult life in France. Dewis was born Isidore Louis Dewachter in Mons, Belgium, the son of Isidore Louis Dewachter and Eloise Desmaret Dewachter. He spent his formative years in Liege where his closest boyhood friend was Richard Heintz (fr:Richard Heintz) (1871-1929), who also became an internationally known landscape artist. Although the name "Dewachter" may have Flemish roots, Dewachter always considered himself a Walloon.