Long ago, a big group of people lived in Europe. 
Long ago, many tribes lived in Europe. They formed a big land called Kievan Rus. A leader named Oleg helped join the lands. He took control of the city of Kiev. 
Long ago, many tribes lived in Eastern Europe. These were the East Slavic, Norse, and Finnic peoples. They eventually formed a large state called Kievan Rus. A prince named Oleg the Wise helped join these lands. He took control of the city of Kiev. This city became a very important place. 
Kievan Rus' was a very important state in Eastern Europe. It lasted from the late 9th century to the mid-13th century. 
The state grew through the work of many different leaders. 
Many famous rulers helped the state grow in different ways. 
At its biggest point, the land covered a huge area. 
Eventually, the state began to change and grow weaker. 
Kievan Rus', also known as Kyivan Rus, was a major early state in Eastern Europe. It existed from the late 9th century until the mid-13th century. 
The formation of the state involved moving through several stages of expansion. 
As the state grew, its leaders introduced new systems of belief and law. 
The origins of the "Rus" people remain a subject of intense scholarly debate. Some historians focus on the "Normanist" theory. This theory suggests the Rus were originally Norsemen who arrived from Scandinavia. The name "Rus" might come from an Old Norse term for "men who row." This is because rowing was the main way to navigate Eastern European rivers. Other historians argue that the Rus were primarily Slavic. They point out that Scandinavian names were quickly replaced by Slavic ones. Most scholars now agree that Norse settlers quickly assimilated into Slavic culture.
At its peak in the mid-11th century, Kievan Rus' covered a massive geographic area. 
The decline of the state was a gradual process driven by internal and external factors. In the late 11th century, the unified state began to disintegrate. It broke into various rival regional powers throughout the 12th century. The decline of the Byzantine Empire also hurt the state. The Byzantine Empire was a major economic partner. As it declined, trade routes through its territory diminished. This loss of trade weakened the economy of the Rus' principalities.
The end of the Kievan Rus' era came with a sudden and violent event. 
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