Halirrhothius // (Greek: Ἁλιρρόθιος) was the son of Poseidon and Euryte (or Bathycleia) in Greek mythology. He was also called the son of Perieres and husband of Alcyone who borne him two sons, Serus and Alazygus. Another son of Halirrhotius, Samos of Mantinea was the victor of the four-horse chariot during the first Olympic games established by Heracles.
When Halirrhothius raped Alcippe, Ares's daughter by Aglaulus, Ares killed him. Ares was then tried for this 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. According to the Parian Chronicle this event took place in 1532/1 BC. 
In another version of the myth, Halirrhothius was sent by his father to cut down the olive that had grown out of the spear of Athena. As he raised his axe, it fell out of his hand and mortally wounded him. The olive was called "fatal" from that circumstance.
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