Wu (p=Wú) was a state during the Western Zhou dynasty and the Spring and Autumn period, outside the Zhou cultural sphere. It was also known as Gouwu (句吳) or Gongwu (工/攻吳) from the pronunciation of the local language. Wu was located at the mouth of the Yangtze River east of the State of Chu and south of the State of Qi. Its first capital was at Meili (梅里, in modern Wuxi), then Helü's City (闔閭, in present-day Xueyan town near Wuxi), and later moved to Gusu (姑蘇, probably in modern Suzhou).
Little is known about the history of Wu before the Spring and Autumn period. Wu rose to power in the 6th century BC, after it was aided by the State of Jin as a useful ally against the State of Chu.
In 584 BC, Wu rebelled against Chu upon the advice of Wuchen, a Jin minister, who defected from Chu. From then on, Wu would become a constant threat to the Chu Kingdom. Wu planted seeds of rebellion amongst Chu's vassals along the Yangtze valley. Wu Zixu, a highly influential Chu politician's father and brother were murdered by King Ping of Chu and fled to Wu plotting revenge. Wu Zixu later became a trusted advisor of Prince Guang and helped him assassinate his cousin King Liao of Wu in order to usurp the throne. After the successful assassination of King Liao, Prince Guang ascended the throne and became known as King Helü of Wu.
In 506 BC, during the reign of King Zhao of Chu, King Helü decided to invade Chu. The king personally led the army, along with his younger brother Fugai, Wu Zixu, as well as Sun Tzu, author of The Art of War. Although Chu had a strong army led by Nang Wa and Shen Yinshu, it suffered a heavy defeat at the Battle of Boju. King Zhao of Chu fled to Sui and the Wu army captured Ying, Chu's capital. After entering Ying, Wu Zixu exhumed King Ping's corpse, and gave it 300 lashes to exact vengeance for his father and brother who were murdered by the Chu King. The military victory led to Wu Zixu's elevation to Duke of Shen and his alias Shenxu. After these victories, Wu briefly became the most powerful state and turned to other campaigns, defeating the State of Qi in 484 BC.
King Helü of Wu is considered to be one of the Five Hegemons of China during the Spring and Autumn period due to his military successes at this time with the help of his famous commander/strategist Sun Tzu. Wu is also generally regarded as developing the first Chinese navy. This navy was quite complex and had different classes of ships. Its "classes" of ships were the great wing ( da yi - 大翼), the little wing ( xiao yi - 小翼), the stomach striker ( tu wei - 突冒), the castle ship ( lou chuan - 楼船), and the bridge ship ( qiao chuan - 桥船). These were listed in the Yuejueshu (越绝书 - Lost Records of the State of Yue) as a written dialogue between King Helü of Wu (r. 514 BC–496 BC) and Wu Zixu (526 BC–484 BC) in which the latter stated:
Nowadays in training naval forces we use the tactics of land forces for the best effect. Thus great wing ships correspond to the army's heavy , little wing ships to light chariots, stomach strikers to , castle ships to Siege tower, and bridge ships to light cavalry.
Ironically, Wu was later threatened by an upstart state to its own south, Yue; Chu then aided Yue's rise as a counter to Wu. Although Wu won a majority of battles against the Yue and captured their king, Goujian, Wu failed to completely subjugate Yue, in part because of King Fuchai of Wu's willingness to let King Goujian live in Wu as his servant. King Goujian suffered for years as Fuchai's servant/slave and planned his revenge. Fuchai under the promise of peace, let Goujian return to Yue, his homeland which later proved to be a fatal mistake for Wu. While Wu was engaged in a military campaign in the north, Goujian enacted his revenge and launched a surprise attack on Wu in 482 BC and conquered the capital. Over the next decade, Wu was unable to recover and Yue absorbed the state in 473 BC.
Wu, Yue, and Chu all proclaimed themselves kings in the 6th century BC, showing the drastic weakening of the Zhou court's authority during the Spring and Autumn period.
Wu and Yue were masters of metallurgy, fabricating excellent swords with incised messages, geometric patterns, and inlaid gold or silver. Wu and Yue swords tend to use much more tin than copper compared to those of other states. Wu often sent swords as gifts to northern states, such as Qi and Cai. Examples include the spearhead of King Fuchai and the sword of Prince Guang.
Wu rulers did not receive after death.
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