Analysis:
Judy (Ming Taizu Chengzu), the prince of Yan, led an army into Beijing. When he came to power, he ordered Fang Xiaoru to draft a memorial for him. Fang Xiaoru only wrote four words "Yan thief usurped the throne", Judy wanted to destroy the nine clans, and Fang Xiaoru said it was ok to destroy the ten clans, so Judy counted all the teachers in Fang Xiaoru as teachers.
At that time, 847 people were killed by collective punishment, that is, nine families were destroyed. When destroying the nine clans, the dead should be beheaded and flogged.
There are two popular sayings.
(1) From grandfather's uncle to Great-great-grandson, they are called Jiuzu. Specifically, it refers to the great-grandfather, great-grandfather, father, son, grandson, great-grandson and great-grandson. But it must be within five clothes!
(2) refers to the blood relationship with the same surname, that is, four generations of paternal families (four generations of one's own family), three generations of matriarchal families (three generations of one's own mother) and two generations of in-laws (two generations of one's own wife), making a total of nine families.
But it must be within five clothes!