Between 550 and 500 BCE, new people settled along the river Tisza and in Transylvania. Their immigration may have been connected either to the military campaigns of king Darius I of Persia (522 BCE - 486 BCE) on the Balkan Peninsula or to the struggles between the Cimmerians and the Scythians. Those people, who settled down in Transylvania and in the Banat, may be identified with the Agathyrsi (probably an ancient Thracian tribe whose presence on the territory was recorded by Herodotus); while those who lived in what is now the Great Hungarian Plain may be identified with the Sigynnae. The new population introduced the use of the potter's wheel in the Carpathian Basin and they maintained close commercial contacts with the neighboring peoples.^[1]