Militarily, it is very different. Military Middle Ages refers to the beginning of Xiongnu's invasion of Europe and the end of hot weapons.

Art began with the Roman Empire's acceptance of the Orthodox Church and ended with the Renaissance.

The history of literature and art are the same.

Sociology is the whole story from the appearance of the Roman emperor to the industrial revolution.

The Middle Ages refers to the feudal social period in Europe. Because the feudal system has different influences on various fields, it is divided into different times. For example, literature and art start late and end early. This is because the establishment of the feudal system affected literature and art, so literature and art entered the feudal society (that is, the Middle Ages), and the development of literature and art promoted the industrial revolution, thus overthrowing the feudal system and stepping out of the Middle Ages.