Why is the circle on the roof strong called the daughter strong?

An ancient bricklayer was busy with his work and had to take his little daughter with him. One day, while building a house on the roof, my little daughter accidentally fell down and died. The craftsman was heartbroken. In order to prevent the tragedy from happening again, he built a low wall on the roof, which was later named "parapet"

This is a legend.

The real origin:

The "architectural style" of the Song Dynasty-"its simplicity is more than the city, and women are to husbands" is the part above the edge of the city wall.

On the east bank of Huaihe River, the ancient cold moon, midnight, peep at the old palace. -Liu Yuxi's "Stone City"

It is very real to talk about arrogance in its cave. ..... also known as the female wall, compared with the city, it is humble and small, if a woman is to her husband. Chapter 31 of the Water Margin: "This Mengzhou City is a small place, and that Tucheng is not so bitter. On one side of the female wall, press the giant with the tip of the knife above and the tip of the stick below. Also known as parapet, parapet and arrow crib.