Here's a short story:

Kievan Rus' begins with the rule (882–912) of Prince Oleg, who extended his control from Novgorod south along the Dnieper river valley in order to protect trade from Khazar incursions from the east and moved his capital to the more strategic Kiev. Sviatoslav I (died 972) achieved the first major expansion of Kievan Rus' territorial control, fighting a war of conquest against the Khazar Empire. Vladimir the Great (980–1015) introduced Christianity with his own baptism and, by decree, that of all the inhabitants of Kiev and beyond. Kievan Rus' reached its greatest extent under Yaroslav I (1019–1054); his sons assembled and issued its first written legal code, the Rus' Justice, shortly after his death. 

The term "Kievan Rus'" (Ки́евская Русь Kievskaya Rus’) was coined in the 19th century in Russian historiography to refer to the period when the centre was in Kiev. In English, the term was introduced in the early 20th century, when it was found in the 1913 English translation of Vasily Klyuchevsky's A History of Russia, to distinguish the early polity from successor states, which were also named Rus. Later, the Russian term was rendered into Belarusian and Ukrainian as Кіеўская Русь Kijeŭskaja Rus’ and Ки́ївська Русь Kyivs'ka Rus’, respectively. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: When did Kievan Rus' began?
Guess: 882
Confidence: <appropriate level of confidence in this guess>

Question: by whom?
Guess: unknown
Confidence: <appropriate level of confidence in this guess>

Question: When did they change their religion?
Guess: Sometime between 980–1015
Confidence: <appropriate level of confidence in this guess>

Question: who was the leader?
Guess: Vladimir the Great
Confidence: <appropriate level of confidence in this guess>

Question: how did he do it?
Guess: with his own baptism
Confidence: <appropriate level of confidence in this guess>

Question: What was Prince Oleg trying to protect?
Guess: trade
Confidence: <appropriate level of confidence in this guess>

Question: When did the name start being used?
Guess: 19th century
Confidence: <appropriate level of confidence in this guess>

Question: why?
Guess: to refer to the period when the centre was in Kiev
Confidence: <appropriate level of confidence in this guess>

Question: Why was it moved there
Guess: unknown
Confidence: <appropriate level of confidence in this guess>

Question: how did they have their first major expansion
Guess: war
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: What was issued?

legal code