I often wrote a word of "daimyou", but do you know that word?
"daimyou" is a feudal lords in Middle ages of Japan.
Some "daimyou" were given a territory by "Shougun" but others took a territory from other "daimyou" by using military power.
*"Shougun" is the leader of SAMURAI.
In the Sengoku era, many samurai wanted to be a "daimyou", so they often betrayed their masters and took the land of them.
This is called "Gekokujou"(social upheaval).