Grimace (fl. mid-to-late 14th century; French: [ɡʁi.mas]; also Grymace, Grimache or Magister Grimache) was a French poet and composer of the ars nova style in late medieval music. Virtually nothing is known about Grimace's life other than speculative information based on the circumstances and content of his five surviving compositions of formes fixes; three ballades, a virelai and rondeau. He is though to have been a younger contemporary of Guillaume de Machaut and based in southern France. Three of his works were included in the Chantilly Codex, which is an important source of ars subtilior music. However, along with P. des Molins, Jehan Vaillant and F. Andrieu, Grimace was one of the post-Machaut generation whose music shows few distinctly ars subtilior features, leading scholars to reco