The dates for the Late Middle Ages are generally given as 1300 to 1500 of the Common Era. These are not dates that correspond to any specific events. In other words, this is not like a war that has a clear beginning and ending date. Instead, these are just approximate dates that are used by historians to try to give a sense of when the period occurred.
The Late Middle Ages are generally seen as a time of great troubles. The main thing that characterizes them is the fact that a number of calamities occurred. As an example of this, the first heading in the link below is “Pestilence and War.” Let us look at three examples of these troubles. First, there was the natural calamity of the Black Death. Second, there was the schism in the Catholic Church (then the only church in Western Europe) in which two or even three popes vied for influence. Finally, there was the Hundred Years’ War that did great harm to France and England.
Thus, the Late Middle Ages are generally seen as a catastrophic time that occurred from 1300 to 1500 of the Common Era.