Did any one person or class hold the most power during the middle ages, or did it shift back and forth?

During the middle ages, the nobles or royalty held most of the power while also sharing a good part of it with the church. The church was followed by everyone while the royalty had limited control over the church. In a way it shifted back and forth but it was mainly in the hands of one ruler.

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.

imma say false because i dont know anything about this.