During the Spring and Autumn period, the Shanghai area belonged to the Kingdom of Wu, which was conquered by the Kingdom of Yue, which in turn was conquered by the Kingdom of Chu. During the Warring States period, Shanghai was part of the fief of Lord Chunshen of Chu, one of the Four Lords of the Warring States. He ordered the excavation of the Huangpu River. Its former or poetic name, the Chunshen River, gave Shanghai its nickname of "Shen". Fishermen living in the Shanghai area created a fishing tool called the hu, which lent its name to the outlet of Suzhou Creek north of the Old City and became a common nickname and abbreviation for the city.