InGreek mythology,Phthius (Ancient Greek:φθῖος) was the eponymous ruler ofPhthiotis in southernThessaly.^[1]

Phthius was the son ofPoseidon andLarisa, daughter ofPelasgus. He was the brother ofAchaeus and the youngerPelasgus.^[1]

Phthius became the father ofAmphictyone who bore toAsterius a son,Dotius (Dotis). The latter being one of the possible eponyms ofDotium (Dotion) in Thessaly.^[2][3]

Phthius together with his brothers, left Achaean Argos with aPelasgian contingent for Thessaly. They then established a colony on the said country naming it after themselves. The only single source of the accounts of Phthius is recounted byDionysius of Halicarnassus in hisRoman Antiquities about the Pelasgian race's migration.^[1]

“In the sixth generation afterwards, leaving thePeloponnesus, they [Pelasgians] removed to the country which was then calledHaemonia and now Thessaly. The leaders of the colony were Achaeus, Phthius and Pelasgus, the sons of Larisa and Poseidon. When they arrived in Haemonia they drove out the barbarian inhabitants and divided the country into three parts, calling them, after the names of their leaders, Phthiotis, Achaia and Pelasgiotis.”

• Dionysus of Halicarnassus,Roman Antiquities. English translation by Earnest Cary in the Loeb Classical Library, 7 volumes. Harvard University Press, 1937–1950.Online version at Bill Thayer's Web Site
• Dionysius of Halicarnassus,Antiquitatum Romanarum quae supersunt,Vol I-IV. . Karl Jacoby. In Aedibus B.G. Teubneri. Leipzig. 1885.Greek text available at the Perseus Digital Library.

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