Traces to
《仪礼·丧服·子夏传》 -
未嫁从父,
既嫁从夫,
夫死从子 ('unmarried, follow the father; married, follow the husband; widowed, follow the son'). The first half of the binomial
三从四德. Today almost always invoked critically - feminist historiography in China uses it as shorthand for the patriarchal ritual code.