Europe

• Edmund I of England
  Edmund I of England
  Edmund I , called the Elder, the Deed-doer, the Just, or the Magnificent, was King of England from 939 until his death. He was a son of Edward the Elder and half-brother of Athelstan. Athelstan died on 27 October 939, and Edmund succeeded him as king.-Military threats:Shortly after his...
  
   succeeds to the throne of England.
• The Arabs lose Madrid
  Madrid
  Madrid is the capital and largest city of Spain. The population of the city is roughly 3.3 million and the entire population of the Madrid metropolitan area is calculated to be 6.271 million. It is the third largest city in the European Union, after London and Berlin, and its metropolitan...
  
   to the Kingdom of Leon
  Kingdom of León
  The Kingdom of León was an independent kingdom situated in the northwest region of the Iberian Peninsula. It was founded in AD 910 when the Christian princes of Asturias along the northern coast of the peninsula shifted their capital from Oviedo to the city of León...
  
  .
• The Battle of Andernach
  Battle of Andernach
  The Battle of Andernach, between the followers and the opponents of King Otto I of Germany, took place at 2 October 939 in Andernach on the Rhine river and ended with a decisive defeat of the rebels and the death of their leaders....
  
  : Otto I
  Otto I, Holy Roman Emperor
  Otto I the Great , son of Henry I the Fowler and Matilda of Ringelheim, was Duke of Saxony, King of Germany, King of Italy, and "the first of the Germans to be called the emperor of Italy" according to Arnulf of Milan...
  
   crushes the rebellion against his rule by a coalition of Eberhard of Franconia and other princes opposed to his rule.

Religion

• July 8 – The Major Occultation, or Ghaybat el-Kubra of Muhammad al-Mahdi
• July 14 – Pope Stephen VIII
  Pope Stephen VIII
  Pope Stephen VIII, a native of Germany, was pope from about July 14, 939 until his death towards the end of October 942.During his pontificate he was subject to Alberic II of Spoleto, Prince of the Romans, and did not effectively rule the Papal States...
  
   succeeds Pope Leo VII
  Pope Leo VII
  Pope Leo VII , Pope from January 3, 936 until his death in 939, was preceded by Pope John XI , and followed by Pope Stephen VIII . Leo VII's election to the papacy was secured by Alberic II of Spoleto, the monarch in Rome. Alberic wanted to choose the pope so that the papacy would continue to...
  
   as the 127th pope
  Pope
  The Pope is the Bishop of Rome, a position that makes him the leader of the worldwide Catholic Church . In the Catholic Church, the Pope is regarded as the successor of Saint Peter, the Apostle...
  
  .

Deaths

• July 13 – Pope Leo VII
  Pope Leo VII
  Pope Leo VII , Pope from January 3, 936 until his death in 939, was preceded by Pope John XI , and followed by Pope Stephen VIII . Leo VII's election to the papacy was secured by Alberic II of Spoleto, the monarch in Rome. Alberic wanted to choose the pope so that the papacy would continue to...
  
  
• October 2 – Gilbert, Duke of Lorraine
  Gilbert, Duke of Lorraine
  Gilbert was the duke of Lotharingia until 939.The beginning of the reign of Gilbert is not clear. A dux Lotharingiae is mentioned in 910 and this may have been Gilbert...
  
  
• October 27 – King Athelstan of England
  Athelstan of England
  Athelstan , called the Glorious, was the King of England from 924 or 925 to 939. He was the son of King Edward the Elder, grandson of Alfred the Great and nephew of Æthelflæd of Mercia...