@PonyPon
Yes.
There is a term used by the Chinese during the Ming Dynasty to describe them.
Wokou.
You gotta know that Japan wasn’t always the wealthy advanced country we know today. For most of their history, they were an impoverished feudalistic shithole torn by centuries of clan warfare. Naturally banditry and piracy thrived in those environments.
The pirates terrorized,l and occupied much of the east coast of China and Korea. Seaborne raiders consisted of poor displaced peasants, low-lives, opportunists, and even rogue leaderless
ronen samurais.