Generally they were not as a knight served a noble. A knight was often a person who was promised a piece of land of the noble's, for a term of service in the noble's military.
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the middle class was the freetowners, it goes POPE KING NOBLES KNIGHTS FREETOWNERS PEASANTS SERFS The Middle Class rose during the Middle Ages in Europe for a variety of reasons. First of these reasons is that the workers became richer in the aftermath of the Black Death. Secondly, education in Europe was greatly improved with the invention of the Printing Press. Thirdly, the formation of banking greatly improved the economy in favour of the Middle Class. Lastly, the formation of medieval republics benefited the Middle Class. The Middle class consisted of Freetowners, people below the knights and nobles but above peasants and serfs... https://sites.google.com/site/seniorschoolstudy/history/rise-of-the-middle-class---middle-ages
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The upper class
During the Middle Ages, artists were mostly independent craftsmen. This put them outside the much talked about structure of medieval social classes, which consisted of peasants, nobles, and clergy. Along with merchants, craftsmen were what we would call middle class, a group most medieval social theorists chose to ignore when they wrote about the structure of feudalism.
In the early days, the upper class people were called the patricians. However when the plebeians gained their upward mobility they also became upper class. So in the later republic both patricians and plebeians were referred to as the aristocrats or the nobility.