The primitive lifestyle of those tribes made an impression on ancient historians. Polybius doubted their Greek heritage, while Livy reports that they spoke a language similar to the Macedonians. On the other hand, Thucydides claims that Eurytanians spoke a very difficult language and ate their food completely raw. They were semi-barbaric, warlike and predatory. They worshiped Apollo as god of tame nature and Artemis as goddess of wilderness. They also worshiped Athena, not as goddess of wisdom, but emphasizing the element of war – i.e. a goddess that was a counterbalance to the god Ares. They called Apollo and Artemis "Laphrios gods," i.e. patrons of the spoils and loot of war. In addition, they worshiped Hercules, the river Achelous and Bacchus. In Thermos, an area north of Trichonis lake, there was after the 7th century a shrine of Apollo “Thermios,” which became a significant religious center during the time of the Aetolian League.