Tai Si is said to be born in the Youxin clan () of the ancestral name Si, from what is now
Heyang County,
Shaanxi Province.
Han dynasty historian
Sima Qian wrote that she was originally from the older
State of Qi or State of Zeng, both in and around modern-day
Henan Province. The traditional story regarding Tai Si's rise to queen says that the future King Wen of Zhou, born Chang, was walking along the banks of the
Wei River one day when he first met Tai Si. Her beauty so captivated Chang that he initially thought she was a goddess or angel. Tai Si proved a woman of benevolence, wisdom, and simple tastes, and Chang decided to take her as his wife. Because the Wei River was not bridged, Chang set out to build one by constructing a number of boats that were arranged end-to-end to form a floating path across the river. Tai Si was impressed, and they were married. After Tai Si joined her husband's family, she is said to have quickly gained favor with the other women of the royal family through her diligent work ethic and demeanor. She and the king had ten sons together, and Tai Si is said to have been an exceptional teacher and mother, such that all of the sons were men of upright virtue and wisdom. ==In literature==