Teres most likely came to dominate central Thrace soon after 480 BC. Building his realm on a priviliged warrior aristocracy, he and his son Sitalces expanded the realm from the Danube in the north to the outskirts of Abdera at the Aegean Sea. He also expanded to eastern Thrace, although he suffered a setback at the hands of the Thynoi. In the north-east, he cemented the position of his realm by allying himself with the kingdom of Scythia under king Ariapeithes, who married Teres' daughter. In conclusion, the Odrysians were the first to superseed the Thracian tribal system and establish a large state in the eastern Balkans.