|Parents||Poseidon and Euryte|
Halirrhothius was a demigod and a son of Poseidon.
Halirrhothius was the son of Poseidon and Euryte. When Halirrhotius raped Alcippe, Ares's daughter by Aglaulus, Ares murdered him. Ares was tried in a court made up of his fellow gods, the first murder trial in history. The trial was held atop the Acropolis of Athens, on what is now known as the Areopagus. Ares was acquitted.