King Zhuang of Chu vs Onjo of Baekje

King Zhuang of Chu, during a campaign against the Rong tribes, asked the Zhou envoy about the size and weight of the Nine Tripod Cauldrons, symbols of royal authority. This act was seen as a challenge to Zhou legitimacy and a claim to supremacy.

King Zhuang of Chu annexed several smaller states, including Chen, Cai, and Xu, expanding Chu's territory significantly. These conquests brought Chu's borders to the Yellow River and increased its population and resources.

King Zhuang implemented administrative reforms, including the appointment of capable officials like Sunshu Ao, who improved irrigation and agriculture. These reforms strengthened Chu's economy and military, supporting its hegemonic ambitions.

King Zhuang of Chu defeated the state of Jin at the Battle of Bi, a major engagement in the struggle for hegemony. The victory established Chu as the dominant power in the Central Plains and marked the peak of Chu's influence.

Onjo, son of Goguryeo founder Jumong, established the Baekje kingdom at Wiryeseong (modern Seoul). He organized the state's early administration and military, laying the foundation for one of Korea's Three Kingdoms.

Onjo expanded Baekje's territory by subjugating local tribes in the Han River basin. He established defensive fortifications and secured the kingdom's borders against rival states.

Onjo introduced a legal code for Baekje, defining laws on property, crime, and governance. This code helped centralize authority and maintain order in the growing kingdom.