Why did ancient Japanese men shave their foreheads?

Accurately speaking, the correct name is "Dai Yue", "Yuexiang" or "Shiheji", and some people call it "Yueti", which is a pseudo-sound, because it "covers the forehead and looks like a moon, so it has this name." . According to legend, Shihe Village, a famous soldier in the Warring States, first combed this bun, so it was called "Shihe bun". At that time, he only shaved his forehead, not shaved. To later generations, he had to shave his forehead and bring it together.

The origin of this comb head is clearly stated in ancient books, but the reason is not clear. Just say, "It is convenient to learn after the Warring States Period." (Note: Helmets) There is a saying on the Internet that is similar to that in ancient books: Because samurai often wear helmets, Japanese helmets often have hair from the forehead to the top of the head (probably due to material and design problems), which will be "bloated" after the war and extremely difficult to comb and trim. This will destroy the samurai's appearance standards. So this hairstyle was invented and adopted by many warriors.

Before that, the Japanese should comb the spine bun. The Book of the New Tang Dynasty (Volume 220) and Biography of Japan record that it has a common ridge bun and no crown belt, and it goes on and on.

Nowadays, there are many images of wandering fields, all of which are combed in a bun, yes, because the moon dynasty was not popular at that time.