Because the medieval era is inextricably linked to what we now call “Europe” geographical entities, it is completely effective to link the definition of the Middle Ages with the important stages in the development of the entity. But this brings us all kinds of challenges. Europe is not an independent geological continent; it is part of a larger land known as Eurasia. Throughout history, its boundaries have changed frequently, and they are still changing today. In the Middle Ages, it was not generally considered to be a unique geographic entity; what we now call Europe is more often regarded as the “Christian world”. Throughout the Middle Ages, no political force could control the entire African continent. Because of these limitations, it has become increasingly difficult to define parameters in a wide historical era that we now call Europe. But perhaps this lack of features can help us define. When the Roman Empire was at its peak, it was mainly composed of land around the Mediterranean. When Columbus sailed historicly to the “new world,” the “old world” extended from Italy to Scandinavia, from Britain to the Balkans and elsewhere. Europe is no longer a wild, wild border, inhabited by “barbarians”, often immigrant culture. It is now “civilized” (although still often in chaos), the government is basically stable, establishing business and learning centers, and the dominant position of Christianity. Therefore, the medieval era may be considered a period in which Europe became a geopolitical entity.