Strabo, Geography

"Phthians" is the name given to those who were subject to Achilles and Protesilaüs and Philoctetes. And the poet is witness to this, for after mentioning in the Catalogue those who were subject to Achilles “"and those who held Phthia,"
”¹he represents these, in the battle at the ships, as staying behind with Achilles in their ships and as being inactive, but those who were subject to Philoctetes as taking part in the battle, having Medon as "marshal,"² and those who were subject to Protesilaüs as "marshalled by Podarces."³ Concerning these, speaking in a general way, he says, “"And there the Boeotians and Ionians with trailing tunics, the Locrians and Phthians and illustrious Epeians;"
”⁴and, in a specific way, “"and in front of the Phthians was Medon, and also Podarces steadfast in war. These in their armour, in front of the great-hearted Phthians, were fighting along with the Boeotians in defence of the ships."
”⁵Perhaps the men with Eurypylus also were called Phthians, since their country indeed bordered on Phthia. Now, however, historians regard as belonging to Magnesia, not only the region round Ormenium, which belonged to the country that was subject to Eurypylus, but also the whole of the country that was subject to Philoctetes; but they regard the country that was subject to Protesilaüs as a part of Phthia, extending from Dolopia and Pindus as far as the Magnetan Sea; whereas the land subject to Peleus and Achilles, beginning at the Trachinian and Oetaean countries, is defined as extending in breadth as far as Antron, the city subject to Protesilaüs, the name of which is now spelled in the plural number. And the Maliac Gulf has about the same length.