The first known Odrysian king was the expansionist Teres I, who is claimed by Thucydides to have been the first Odrysian king altogether. Writing in the late 5th century BC, he wrote that Teres "was the first powerful king of the Odrysae" and that he "was the first founder of the great Odrysian empire, which he extended over a large part of Thrace, although many of the Thracian tribes are still independent." Said independent tribes consisted of Thracians living along parts of the Aegean coast and in parts of the Rhodope mountains and as well as the powerful Triballi around the Haemus.