Timanthes in Wikipedia

Timanthes of Cythnus (or Sicyon) was an ancient Greek painter of the 4th century BC. The most celebrated of his works was a picture representing the sacrifice of Iphigenia, in which he finely depicted the emotions of those who took part in the sacrifice; however, despairing of rendering the grief of Agamemnon, he represented him as veiling his face. A painting discovered at Pompeii, and now in the Museum at Naples, has been regarded as a copy or echo of this painting (Wolfgang Helbig, Wand gemalde Campaniens, No. 1304).