Zhao was one of the seven major states during the Warring States period of ancient China. It emerged from the tripartite division of Jin, along with Han and Wei, in the 5th century BC. Zhao gained considerable strength from the military reforms initiated during the reign of King Wuling, but suffered a crushing defeat at the hands of Qin at the Battle of Changping. Its territory included areas in the modern provinces of Inner Mongolia, Hebei, Shanxi and Shaanxi. It bordered the states of Qin, Wei, and Yan, as well as various nomadic peoples including the Hu and Xiongnu. Its capital was Handan, in modern Hebei province.

Ancient Chinese states were dynastic polities of China within and without the Zhou cultural sphere prior to Qin's wars of unification. They ranged in size from large estates, to city-states to much vaster territories with multiple population centers. Many of these submitted to royal authority, but many did not—even those that shared the same culture and ancestral temple surname as the ruling house. Prior to the Zhou conquest of Shang, the first of these ancient states were already extant as units of the preceding Shang dynasty, Predynastic Zhou, or polities of other cultural groups. Once the Zhou had established themselves, they made grants of land and relative local autonomy to kinfolk in return for military support and tributes, under a system known as fengjian.