The conventional answer is that the middle class developed in the High Middle Ages.
It should be understood that the middle class had existed all along, but were not especially important until the High Middle Ages, when their power and numbers became socially important. For example, the earliest guilds were made up of middle class people, and while it is known that some of these existed in the 6th century, the actual date of founding is unknown, so they may have been inherited from Roman times. Guilds of stone cutters and glass makers seem to have originated before the Middle Ages began.
Also, there were places where the government was always republican, and the nobility were either absent from the system or had relatively insignificant roles; the Republic of Venice was one such place.
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The middle class developed in the middle ages and was formed out of baker, merchants and trades people who were allowed to own their own land. They operated businesses that sold to the peasants and were free to move around.
The High Middle Ages lasted from 1000 AD to 1250 AD
Early Middle Ages 400 - 700, High Middle Ages 700 - 1300, Late Middle Ages 1300 -1500.
The third period of the Middle Ages was the Late Middle Ages. The first is called the Early Middle Ages or the Dark Age. The second period was the High Middle Ages.
The Roman Empire was followed by the Middle Ages: Early Middle Ages (5th to 10th century), High Middle Ages (c. 1001 to 1300) and Late Middle Ages (1300 to 1500).
In the High Middle Ages, there was a growth of the population of Europe, towns and cities became more numerous and larger, the arts flourished, universities were founded, mathematics developed, especially with the adaption of Arabic numerals, trade developed, transportation developed, and the early parliaments were founded.
If you think about it, there was always a middle class, a class that was neither peasant nor nobility. The middle class included stewards for noblemen, lawyers, physicians, jewelers, and a variety of other people who provided services to the wealthy and important, but who were not members of the nobility itself. Prior to the High Middle Ages, when the crusades happened, the middle class was very small. The emergence of the middle class, as a group with political power, began in such places as Venice, where government was republican from its founding in 697, and other medieval city states and communes. The strength of the middle class spread across Europe with various circumstances and developments, such as the rise of guilds, which possibly began at the beginning of the Middle Ages. The crusades were important, but the rise of the middle class can be traced back further.
low class, middle class, upper class/high class
the age before the dark ages is the high middle ages
vernecular was an everday language the two types were the chaucer and the christine. these two languages were made in the middle east to help their citizens understand literasture
At the beginning of the High Middle Ages, the architecture was Romanesque. Later in that time, the Gothic emerged.
There were several technological advances in the Early Middle Ages that paved the way for the High Middle Ages. One was the invention of the horse collar. Another was the heavy plow. Another was the three field system of crop rotation. Yet another was the horse shoe. Among them these increased agricultural production in Europe quite a lot, making it possible to support the towns and cities of the High Middle Ages. Another set of technologies were the invention of the stirrup and the arched saddle. These combined with the introduction of a new type of lance and the tactics to use it radically altered the technology of warfare and made the mounted knight paramount on battlefields of the High Middle Ages. There is an important point to be made here, however. The advances that caused Europe to pass from the Early Middle Ages to the High Middle Ages were more social and political than technological. The technological developments above were not things developed or invented immediately before the High Middle Ages, but introduced over a long period, and their effects accumulated slowly.