Halirrhothius was the son of Poseidon and Euryte (or Bathycleia) in Greek mythology. When Halirrhothius raped Alcippe, Ares's daughter by Aglaulus, Ares murdered him; Ares was tried in a court made up of his fellow gods. The trial was held on a hill adjacent to the Acropolis of Athens, known as the Areopagus. Ares was acquitted.

Halirrhothius was the son of Poseidon and Euryte (or Bathycleia) in Greek mythology. When Halirrhothius raped Alcippe, Ares's daughter by Aglaulus, Ares murdered him; Ares was tried in a court made up of his fellow gods. The trial was held on a hill adjacent to the Acropolis of Athens, known as the Areopagus. Ares was acquitted.