The fall of the capital of the Western Zhou Dynasty, Hao ( 镐 ) , marks the beginning of the Spring and Autumn Period ( 春秋时期 ) , which represented an era in Chinese history between 722 BC and 403 BC. During the flight from the western capital to the east, the Zhou king relied on the nearby lords of Qin ( 秦 ) , Zheng ( 郑 ) and Jin ( 晋 ) for protection from barbarians and rebellious lords.

The fleeing elite of Zhou Dynasty did not have strong footholds in the eastern territories; even the crown prince's coronation had to be supported by those states to be successful. With the Zhou domain greatly reduced, limited to Luoyang and nearby areas, the Zhou court could no longer support six groups of standing troops ( 六军 ) . Subsequent Zhou kings had to request help from neighboring or powerful states for protection from raids and for resolution of internal power struggles. The Zhou court would never regain its original authority; the Zhou court was relegated to being merely a figurehead of the feudal states.

The newly powerful states were more eager to maintain aristocratic privileges over the traditional ideology of supporting the weak ruling entity during times of unrest ( 匡扶社稷 ), which had been widely propagated during imperial China to consolidate power into the ruling family.

Dukes Huan of Qi ( 齐桓公 ) and Wen of Jin ( 晋文公 ) made further steps in installing the overlordship system, which brought relative stability, but in shorter time periods than before. Annexations increased, favoring the several most powerful states, including Qin, Jin, Qi and Chu ( 楚 ) . The overlord role gradually drifted from its stated intention of protecting weaker states; the overlordship eventually became a system of hegemony of major states over weaker satellites of Chinese and "barbarian" origin.

The great states used the pretext of aid and protection to intervene and gain advantages over the smaller states during their internal quarrels. Later overlords were mostly derived from these great states. They proclaimed themselves master of their territories, without even recognizing the petty figurehead of Zhou. Establishment of the local administration system, with its officials appointed by the government, gave states better control over the dominion. Taxation facilitated commerce and agriculture more than proto-feudalism.

The three states of Qin, Jin and Qi not only optimized their own strength, but also repelled the southern state of Chu , whose rulers had proclaimed themselves kings. The Chu armies gradually intruded into the Yellow River Basin . Framing Chu as the "southern barbarian", Chu Man , was merely a pretext to warn Chu not to intervene into their respective spheres of influence. Chu intrusion was checked several times in three major battles with increasing violence - the Battle of Chengpu ( 城濮之战 ) , the Battle of Bi and the Battle of Yanling; this resulted in the restorations of the states of Chen ( 陈 ) and Cai ( 蔡 ) .

After a period of increasingly exhaustive warfare, Qi, Qin, Jin and Chu finally met for a disarmament conference in 579 BC, where the other states essentially became satellites. In 546 BC, Jin and Chu agreed to yet another truce.

During the relatively peaceful 6th century BC, the two coastal states in today's Zhejiang ( 浙江 ) , Wu ( 吴 ) and Yue ( 越 ) , gradually grew in power. After defeating and banishing King Fu Chai of Wu ( 吴王夫差 ) , King Gou Jian of Yue ( 越王勾践 ) became the last recognized overlord.