I just finished reading a history book about medieval Europe, it was a time of constant change, turmoil and political flux. The Entirety of Europe changed over the course of the end of the Roman Empire and the realisation that "greater Christendom" was the replacement, however that slowly petered out and "ended" as an idea around the time of the anti popes and Philip the 3rd IIRC. Which led to the rise of nationalism as an idea and the modern concept of the nation state.

It's a very dense book and I didn't remember most of the names and dates but there wasn't really a time where nothing was happening, whether it was the increasing technology that allowed farming and feudalism to develop or the rise of city states based around maritime trade.