Parthia was identified by Zhang Qian as an advanced urban civilization
"Anxi is situated several thousand li west of the region of the Great Yuezhi. The people are settled on the land, cultivating the fields and growing rice and wheat. They also make wine out of grapes. They have walled cities like the people of Dayuan (Ferghana), the region contains several hundred cities of various sizes. The coins of the country are made of silver and bear the face of the king. When the king dies, the currency is immediately changed and new coins issued with the face of his successor. The people keep records by writing on horizontal strips of leather. To the west lies Tiaozhi (Mesopotamia) and to the north Yancai and Lixuan (Hyrcania)."(Shiji,123, Zhang Qian quote, trans. Burton Watson).