Kyivan Rus' was the first eastern Slavic state and was founded by Varangians around the 9th century. The first rulers of Kyivan Rus' were Askold and Dyr. However, Prince Oleh killed Askold and Dyr in 882 and took control. Oleh declared Kyiv the capital of the Kyivan Rus' state. In 911, Oleh conquered Constantinople and a few years later he established an important relationship with the Byzantine Empire. Another successful prince was Sviatoslav, who defeated the Greeks and the Bulgarians, which allowed him to unite all of the East Slavic states under Kyivan rule. Following Sviatoslav was Volodymyr the Great, who adopted Orthodox Christianity in 988, which became the official religion of Kyivan Rus'. Yaroslav the Wise was the next prince and Kyivan Rus' was during its Golden Age throughout his rule. Yaroslav created the first law code, expanded relations with Europe, and founded school systems. After his death, Volodymyr Monomakh unified Kyivan Rus' under his reign and he wrote a testament called Pouchenie, which was created to protect the poor. In the last 100 years of the Kyivan state, there were 24 princes because of civil war. The civil wars weakened Kyivan Rus', and the state ended in 1240, when the Mongols destroyed Kyiv ("Kyivan Rus'").
Prince Yaroslav the Wise
Prince Yaroslav the Wise was born in 978 and was the son of Volodymyr the Great. Yaroslav ruled Kyivan Rus' from 1036 until his death in 1054. After his father's death in 1015, he waged a war against his brother for the Kyivan throne. Yaroslav and his army were victorious and gained control of the Kyivan throne. By 1030, Yaroslav had conquered the land between the Baltic Sea and Lake Peipus. In 1036, his army defeated the Pechenegs, when the Pechenegs attacked Kyiv. In 1037, the Saint Sophia Cathedral was built, which was during the height of the Kyivan Rus'. In addition, he built a brick wall surrounding Kyiv with Golden Gates for the entrance. Yaroslav improved relations with Europe and the Byzantine Empire by marrying a Swedish princess. He established the first east Slavic legal code called Ruska Pravda. Furthermore, he promoted and encouraged education by building a library called the Kyivan Cave Monastery. Yaroslav devised a plan to separate the territory among his sons, but his plan failed when his sons fought each other for the land anyway. One of the most important accomplishments in Yaroslav's life was that he built over 400 churches during his reign. Yaroslav was buried in the Saint Sophia Cathedral in a marble sarcophagus ("Yaroslav the Wise").
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Mongol Invasion
Nomads told the princes of Rus' that there were Mongol warriors heading toward Kyivan Rus'. The Mongols were also known as tartars to Eastern Europeans. The Mongol Invasion began in 1223, which took place at the Battle of the Kalka River. Since the princes controlled different territories, they combined forces to fight the Mongols. Despite the combined forces, the Mongols defeated the Kyivan army. However, the Mongol army retreated and rebuilt their army for the next thirteen years. Instead of the Rus' princes getting ready for another Mongol invasion, they continued with their civil wars. In 1236, the Mongol army was as large as 150,000 men and it was led by Batu Khan. By 1238, the Mongols destroyed the armies of the Volga Bulgarians and the Kypchaks. In the summer of 1238, Batu Khan led the army to obliterate Crimea and Mordovia. In December 1240, the Mongol army destroyed Kyiv and the Kyivan State fell apart. The year 1240 was when Kyivan Rus' officially ended. Most cities never fully recovered from the Mongol invasion. Only two parts of the Kyivan Rus' did not end up under Mongol control, which were the states of Galicia and Volhynia ("Mongol Invasion of Rus").
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References:
"Yaroslav the Wise." 1993. 6 Feb. 2009 <http://www.encyclopediaofukraine.com/pages/Y/A/YaroslavtheWise.htm>.
"Kyivan Rus'" 1989. 6 Feb. 2009 <http://www.encyclopediaofukraine.com/display.asp?linkpath=pagesKYKyivanRushDA.htm>.
"Mongol Invasion of Rus'" 6 Feb. 2009 http://www.nationmaster.com/encyclopedia/Mongol-invasion-of-Rus




