Daimyo rose to power in the early 1100's and stayed like that until 1192 when shoguns came to power. Daimyos had several wars with each other for land control. This was until the first shogun came and ended the wars. Daimyo still control land and armies but, Shoguns now rule over them for government reasons. Since Daimyo control land, they also control the people in that land, Peasants. Peasants are just regular people. The army of people a Daimyo controls are called Samurais. Samurais also pledge their allegiance to Daimyo.
This is a picture of a Samurai -------->
Feudalism gave advantages and disadvantages to Daimyo in several different ways like, Daimyo basically got their own small country. A disadvantage is that they were constantly at war with each other. A Daimyo's life was easy but, nerve-racking with being in constant fear of other armies and commanding your own army. The easy part was telling people what land they can and can't be on and having body guards around you at all times during the day.
Picture of a Daimyo's helmet ------>