Upper middle-class usually consists of high professions and upper-level managerial positions where the practicioners are required to hold postgraduate degrees. For instance, a surgeon would be upper...
The lines distinguishing one class from another are quite blurry these days. It would be fair to say, however, that it used to be middle classes were all professionals with university degrees...
There wasn't a "middle class" and that is a modern idea. In the middle ages you were one of three types of people. The church, noble, or serf/peasant. A middle class won't develop until the...
In the middle ages the king was obviously at the top and the peasants at the bottom so the "Upper Middle Class" would have been comprised of nobles because the nobles were ranked amongst themselves...