Duke Jian of Qin

Duke Jian of Qin (Chinese: 秦簡公; pinyin: Qín Jiǎn Gōng; 428–400 BC), personal name Ying Daozi, was a duke of the state of Qin during the Eastern Zhou dynasty, reigning from 414 to 400 BC.^[1][2]

Duke Jian of Qin 秦簡公
Ruler of Qin
Reign	414–400 BC
Predecessor	Duke Ling of Qin
Successor	Duke Hui II of Qin
Born	428 BC
Died	400 BC (aged 28)
Names Ying Daozi (嬴悼子) Posthumous name Duke Jian (簡公)
House	Ying
Dynasty	Qin
Father	Duke Huai of Qin

Duke Jian was the younger son of Duke Huai and the uncle of his predecessor Duke Ling. When Duke Ling died in 415 BC, the throne was passed to Duke Jian instead of Duke Ling's son, the later Duke Xian.^[1][2]

During Duke Jian's reign, the Qin state was defeated several times by the Wei state, then a major power of the Warring States period.^[3]

Duke Jian reigned for 15 years and died in 400 BC at the age of 28. He was succeeded by his son, Duke Hui II.^[1][2]