Japan and Korea's strong relationship was begun at the Baekje, state that existence in the period of the Three State. At that time, Japan was not powerful country.
This map is period of the Three State give to Japan. Yellow part of this map is Goguryeo, light green is Baekje, Dark green is Silla. |
After Three States and Japan know each other, Baekje are teach them Buddism, Hanja, and art, Silla teach them how to make strong ship, and Goguryeo teach them politics. So, Japan serve these three state as bother. Expecially Baekje. Baekje and Japan were really close, so they send envoies alot. Also, Baekje's king give to Japan's king Seven Branch Sword(Chiljido). But after Baekje destroyed to Silla, Japan became pirate and plunder all the Silla and China's coast cities. they take famous potters and other useful technicians. and also deforcement Taemado island(Tsushima island in Japan).