Asia

• Oleg
  Oleg of Novgorod
  Oleg of Novgorod was a Varangian prince who ruled all or part of the Rus' people during the early 10th century....
  
   leads the Kievan Rus'
  Kievan Rus'
  Kievan Rus was a medieval polity in Eastern Europe, from the late 9th to the mid 13th century, when it disintegrated under the pressure of the Mongol invasion of 1237–1240....
  
   in a campaign against Constantinople
  Constantinople
  Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...
  
   (see Rus'-Byzantine War (907)
  Rus'-Byzantine War (907)
  The Rus'–Byzantine War of 907 is associated in the Primary Chronicle with the name of Oleg of Novgorod. The chronicle implies that it was the most successful military operation of the Kievan Rus' against the Byzantine Empire. Paradoxically, Greek sources do not mention it at all.- Primary Chronicle...
  
  ).
• Abaoji
  Emperor Taizu of Liao
  The Emperor Taizu of Liao was the first emperor of the Liao Dynasty . His given name was Abaoji . Some sources also suggest that the surname Yelü was adopted during his lifetime, though there is no unanimity on this point....
  
   is named Great Khan of the Khitan
  Khitan people
  thumb|250px|Khitans [[Eagle hunting|using eagles to hunt]], painted during the Chinese [[Song Dynasty]].The Khitan people , or Khitai, Kitan, or Kidan, were a nomadic Mongolic people, originally located at Mongolia and Manchuria from the 4th century...
  
  .
• Yelü Abaoji establishes the Liao (Khitan) Dynasty
  Liao Dynasty
  The Liao Dynasty , also known as the Khitan Empire was an empire in East Asia that ruled over the regions of Manchuria, Mongolia, and parts of northern China proper between 9071125...
  
  .
• The Tang Dynasty
  Tang Dynasty
  The Tang Dynasty was an imperial dynasty of China preceded by the Sui Dynasty and followed by the Five Dynasties and Ten Kingdoms Period. It was founded by the Li family, who seized power during the decline and collapse of the Sui Empire...
  
   is ended.
• The Later Liang Dynasty
  Later Liang Dynasty
  The Later Liang was one of the Five Dynasties during the Five Dynasties and Ten Kingdoms Period in China. It was founded by Zhu Wen, posthumously known as Taizu of Later Liang, after he forced the last emperor of the Tang dynasty to abdicate in his favour...
  
   is founded by Zhu Wen, the first of northern China's Five Dynasties.
• The Former Shu
  Former Shu
  Great Shu called in retrospect Former Shu was one of the Ten Kingdoms formed during the chaotic period between the rules of the Tang dynasty and the Song dynasty...
  
   Kingdom is founded by Wang Jian in Chengdu
  Chengdu
  Chengdu , formerly transliterated Chengtu, is the capital of Sichuan province in Southwest China. It holds sub-provincial administrative status...
  
  .
• The Wuyue State
  Wuyue
  Kingdom of Wuyue , 907-978, was a small independent coastal kingdom founded during the Five Dynasties and Ten Kingdoms of Chinese history. It was ruled by the Qian family, which remains widespread in the kingdom's former territory.-Founding:...
  
   is founded by Qian Liu
  Qian Liu
  Qian Liu , courtesy name Jumei , nickname Poliu , formally King Wusu of Wuyue with the temple name of Taizu , was founder and first king of the Kingdom of Wuyue during the Five Dynasties and Ten Kingdoms Period, ruling over roughly modern Zhejiang on the east coast of China.- Background :Qian...
  
   in Hangzhou
  Hangzhou
  Hangzhou , formerly transliterated as Hangchow, is the capital and largest city of Zhejiang Province in Eastern China. Governed as a sub-provincial city, and as of 2010, its entire administrative division or prefecture had a registered population of 8.7 million people...
  
  .
• The short-lived Qi State is founded in northwest China
  China
  Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...
  
  .

Europe

• Bratislava
  Bratislava
  Bratislava is the capital of Slovakia and, with a population of about 431,000, also the country's largest city. Bratislava is in southwestern Slovakia on both banks of the Danube River. Bordering Austria and Hungary, it is the only national capital that borders two independent countries.Bratislava...
  
  , the present-day capital of Slovakia
  Slovakia
  The Slovak Republic is a landlocked state in Central Europe. It has a population of over five million and an area of about . Slovakia is bordered by the Czech Republic and Austria to the west, Poland to the north, Ukraine to the east and Hungary to the south...
  
  , is mentioned for the first time in written sources, in reference to the Battle of Bratislava.
• Chernihiv
  Chernihiv
  Chernihiv or Chernigov is a historic city in northern Ukraine. It is the administrative center of the Chernihiv Oblast , as well as of the surrounding Chernihivskyi Raion within the oblast...
  
   is founded in the Ukraine
  Ukraine
  Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...
  
  .

Deaths

• May 2 – Boris I, Bulgarian Khan (ruled 852
  852
  Year 852 was a leap year starting on Friday of the Julian calendar.- Europe :* Saint Swithun becomes Bishop of Winchester, England....
  
  –889
  889
  Year 889 was a common year starting on Wednesday of the Julian calendar.- Asia :* Yasovarman I succeeds Indravarman II as ruler of the Khmer empire....
  
  )
• Árpád
  Árpád
  Árpád was the second Grand Prince of the Hungarians . Under his rule the Hungarian people settled in the Carpathian basin. The dynasty descending from him ruled the Hungarian tribes and later the Kingdom of Hungary until 1301...
  
  , Hungarian ruling prince (ruled 895
  895
  Year 895 was a common year starting on Wednesday of the Julian calendar.- Europe :* The seven tribes of the Magyars settle in the Carpathian Basin under the leadership of Árpád...
  
  –907)