In Greek mythology, Pisus (Ancient Greek: Πῖσός or Πίσον means ‘meadows’), also Peisus or Peisos (Πεῖσος), may refer to two different characters:

• Pisus, a Messenian prince who later founded Pisa in Elis. He was the son of King Perieres of Messenia^[1] and possibly Gorgophone, daughter of Perseus. In one version of the myth, Pisus’ parents were instead Aphareus, another Messenian king, and Arene, and his brothers were Idas and Lynceus,^[2] rivals of the Dioscuri. He was the one of the first persons (the other two being Pelops and Heracles) to have established the festival and the contest at Olympia.^[3] Also, Pisus founded and instituted Zeus’ worship on the area.^[4]
• Pisus, king of the Celts and son of Apollo. He was the reputed founder of Pisa in Etruria after he had waged war with the Samnites and received their widowed queen who succeeded to the government after the death of her husband.^[5]

This article includes a list of Greek mythological figures with the same or similar names. If an internal link for a specific Greek mythology article referred you to this page, you may wish to change the link to point directly to the intended Greek mythology article, if one exists.