Tai Si was the wife of King Wen of Zhou and is revered as a highly respected woman of ancient China. She was a descendant of Yu the Great – founder of the Xia dynasty – and was the mother of ten sons, including King Wu of Zhou – founder of the Zhou dynasty – and his younger brother the Duke of Zhou.
Particularly respected by Wu Zetian, China's only Empress regnant, Tai Si and King Wen were posthumously given the temple names "Shizu" (Chinese: 始祖; lit. 'founding ancestor') in 690 AD.