What age in the early Middle Ages is rich in important events?

One of the richest centuries in the Middle Ages is 9. During this period, new states were formed on the territory of Western Europe. Feudal fragmentation there reached its maximum level. In Eastern Europe, large-scale actions were also taken to form new states. At this time, the Eastern Slavs were invited to rule in the northern principalities of the Varangian Rurik. And after him Oleg ruled, who created a single state of Rus, uniting Kiev and Novgorod. Byzantium during this period influenced the culture of Rus.