Han (Warring States) in the context of "Han Fei"

Qin's wars of unification were a series of military campaigns launched in the late third century BC by the state of Qin against the other six states remaining in China – Han, Zhao, Yan, Wei, Chu and Qi. Between 247 and 221 BC, Qin had developed into the most powerful of China's Seven Warring States that coalesced in the wake of the declining Zhou dynasty, which had been reduced to a weak and merely ceremonial position during the Warring States period. In 230 BC, Ying Zheng, the King of Qin, began the sequence of campaigns that would bring the Warring States period to a close, setting out to conquer each of the six states one by one. This was completed in 221 BC with the fall of Qi, which further led to a more centralised form of government replacing the fengjian system of the Zhou dynasty. Ying Zheng declared himself the First Emperor – or Shi Huangdi – of a unified China under the Qin dynasty.

Shen Buhai (Chinese: 申不害; c. 400 BC – c. 337 BC) was a Chinese statesman, reformer and diplomat. According to the Shiji, Shen Buhai served as Chancellor of the Han state under Marquis Zhao of Han, for around fifteen years to his natural death in office in 337 BC, ordering its government and doctrines emphasizing Shu 术 (administrative) technique, though the likely late term is Han Fei's. A contemporary of syncretist Shi Jiao and Shang Yang, Shen was born in the central State of Zheng, likely serving as a minor official there. After Han completed the conquest and division of Zheng and Wei in 376 BC, he rose up in the ranks of the Han officialdom, reforming its administration, military defenses, and to a lesser extent law only about a half century after its founding.

Influencing the Han Feizi, Shen Buhai seemed to play an influence on Han dynasty reformers, and likely even the establishment of the civil service examination. With the imperial examination extending in influence to the European civil service, Shen Buhai could perhaps be considered a founder in world bureaucracy, and even the first political scientist. However, it is not as evident that he was as well known as another of the Han Feizi's figures, Shen Dao, during their lifetimes. His administrative ideas were influential enough to become one of the Xun Kuang's critiqued "Twelve Masters" in the later Warring States period, and might have been renowned by the time the Han Feizi was written.

Zhao (traditional Chinese: 趙; simplified Chinese: 赵) 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.

Zhao was home to the administrative philosopher Shen Dao, Confucian Xun Kuang, and Gongsun Long, who is affiliated to the school of names.

The Seven Warring States or Seven Kingdoms (traditional Chinese: 戰國七雄; simplified Chinese: 战国七雄; pinyin: zhàn guó qī xióng) were the seven leading hegemonic states during the Warring States period (c. 475 to 221 BC) of ancient China:

• Han (韓/韩), defeated by Qin in 230 BCE
• Zhao (趙/赵), defeated by Qin in 228 BCE
• Wei (魏), defeated by Qin in 225 BCE
• Chu (楚), defeated by Qin in 223 BCE
• Yan (燕), defeated by Qin in 222 BCE
• Qi (齊/齐), defeated by Qin in 221 BCE
• Qin (秦)

During the Eastern Zhou dynasty, the weakened Zhou central sovereignty quickly lost control of its confederate vassal states, and the numerous autonomous states began overreaching and expanding their political ambitions via diplomacy and warfare, sparking a period of chaotic conflicts known as the Spring and Autumn period. After most of the smaller, weaker states were conquered and annexed by larger states, the geopolitical landscape eventually became dominated by seven most powerful states, and wars became increasingly pitched and violent. Over the Warring States period, many of the seven states underwent bureaucratic and military reforms in order to mobilise resources on a greater scale. This led to an intensification of warfare over the period, but also led to significant economic and cultural developments.

Wei (/weɪ/; Chinese: 魏; pinyin: Wèi) was one of the seven major states during the Warring States period of ancient China. It was created from the three-way Partition of Jin, together with Han and Zhao. Its territory lay between the states of Qin and Qi and included parts of modern-day Henan, Hebei, Shanxi, and Shandong. After its capital was moved from Anyi to Daliang (present-day Kaifeng) during the reign of King Hui, Wei was also called Liang (Chinese: 梁; pinyin: Liáng).

It should not to be confused with the smaller central Wey state 衞, which is still sometimes only differentiated by its Chinese character.

Jin (traditional Chinese: 晉; simplified Chinese: 晋, Old Chinese: *tsi[n]-s), originally known as Tang (唐), was a major state during the middle part of the Zhou dynasty, based near the centre of what was then China, on the lands attributed to the legendary Xia dynasty: the southern part of modern Shanxi. Although it grew in power during the Spring and Autumn period, its aristocratic structure saw it break apart when the duke lost power to his nobles. In 403 BC, the Zhou court recognized Jin's three successor states: Han, Zhao, and Wei. The Partition of Jin marks the end of the Spring and Autumn period and the beginning of the Warring States period.

The Partition of Jin (simplified Chinese: 三家分晋; traditional Chinese: 三家分晉; pinyin: Sānjiā Fēn Jìn; lit. 'Three Families Partitioning Jin'), refers to the division of the State of Jin between rival families into the three states of Han, Zhao and Wei, a watershed event marking the division between the Spring and Autumn and Warring States periods. Proceeding from the Jin, the three states were often referred to as the "Three Jins" (三晋; 三晉; Sān Jìn).

Because the process took several decades, there is some debate between scholars as to the year which best marks the true partition of Jin. Kiser & Cai (2003) state the most common dates picked by historians are 481, 475, 468, and 403 BCE. The last date, according to Sima Guang marks the conferring of Marquessates by King Weilie of Zhou on Wei Si, ruler of the State of Wei; Zhao Ji, ruler of the State of Zhao, and Han Qian, ruler of the State of Han.