In Greek mythology, Onthyrius or Onthyrios (Ancient Greek: Ὀνθυρίου) was the satyr who joined the army of Dionysus in his campaign against India. He was struck on his brow by Tectaphus with a pitiless blade.Nonnus, Dionysiaca 30.137
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References
Nonnus of Panopolis, Dionysiaca translated by William Henry Denham Rouse (1863–1950), from the Loeb Classical Library, Cambridge, MA, Harvard University Press, 1940. Online version at the Topos Text Project. Nonnus of Panopolis, Dionysiaca. 3 Vols. W.H.D. Rouse. Cambridge, MA., Harvard University Press; London, William Heinemann, Ltd. 1940–1942. Greek text available at the Perseus Digital Library.