The State of Cao (simplified Chinese: 曹国; traditional Chinese: 曹國; pinyin: Cáoguó) was a vassal state in China during the Zhou dynasty (1046–221 BC). The state was founded sometime in the 11th century BC by Shu Zhenduo of Cao (d. 1053 BC), a son of King Wen of Zhou and younger brother of King Wu of Zhou. With its capital at Taoqiu (陶丘), the State of Cao covered roughly the area of modern-day Dingtao County, Shandong Province. It was located on the flat country of the North China Plain about 50 miles east of the point where the current course of the Yellow River changes from east to north-east. To the northwest was Wey, to the northeast Lu and to the southeast Song.
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Cao (state) in the context of Wey (state)
Wei (/weɪ/; Chinese: 衞; pinyin: Wèi), commonly spelled Wey to distinguish from the contemporary larger Wei (魏) state, was an ancient Chinese state that was founded in the early Western Zhou dynasty and rose to prominence during the Spring and Autumn period. Its rulers were of the surname Ji (姬), the same as that of the rulers of Zhou. It was located in modern northeastern Henan Province, east of Jin (and later Wei 魏), and west of Cao.