It's called the tumulus period during the 3rd century from the second half to around 7th century.
Tomb has spread rapidly around the archipelago.
Especially famous is the Japanese keyhole-shaped tomb.
It is thought that I express that the local politics group which stood side by side in the various parts of Japan rallies it and formed Yamato sovereignty.
The 4th century second half
YAMATO royal authority made rule of a chain of islands body hard.
Start foray into the Korean Peninsula in search of iron resources , which is a raw material of arms and farming tools.
And also began to intervene in international relations of the peninsula countries.
Korea and Chinese technology and cultural relics has flowed to Wa as a trigger this.
Buddhism transmission.(538)
It becomes Prince Shotoku regent.(593)
