Answer:
After the fall of the Western Roman Empire in 476 CE, several different empires and kingdoms rose and fell in Europe and the Mediterranean region.
One of the most significant empires to form after the fall of the Roman Empire was the Byzantine Empire, which emerged in the eastern part of the Roman Empire and lasted for over a thousand years until it fell to the Ottoman Turks in 1453.
In the western part of the Roman Empire, many different kingdoms and empires emerged, including the Visigothic Kingdom in Spain, the Frankish Kingdom in France, and the Ostrogothic Kingdom in Italy. These kingdoms and empires were often in conflict with each other and with neighboring powers, and many of them eventually fell to invading forces such as the Moors, the Vikings, or the Magyars.
In terms of government, the Byzantine Empire maintained many of the institutions and traditions of the Roman Empire, including a powerful emperor, a complex bureaucracy, and a legal system based on Roman law. In the west, the various kingdoms and empires that emerged after the fall of Rome had a wide range of different forms of government, from absolute monarchies to more democratic systems of government that involved representation by local councils or assemblies.