AD 1002: The St. Brice's Day Massacre - King of Wessex, Æthelred II, sanctioned the mass killing of all Danes across England. The exact number of deaths is unknown, however we have found various relevant burial sites in Dorset, Oxford, etc.
AD 1004: The Chanyuan Treaty was signed by the Song Dynasty and the Khitan Empire, ending the prolonged war in between them. According to the Treaty, the Song Dynasty was "a brotherly state" to the Khitan Empire, though the former must donate 100,000 liang-s of silver (one liang equals to about 37 grams) and 200,000 liang-s of fine fabric to the latter, in order to "ensure the state of peace can continue".
AD 1006: The brightest supernova ever recorded, SN 1006, occurs in the constellation of Lupus. It is observed and described in China, Japan, Iraq, Egypt, and Europe and possibly depicted in North American rock art. Modern astronomers now consider its distance at about 7,200 light-years. The supernova provides enough light to read by on a night with a dark moon.
AD 1008: Murasaki Shikibu began writing her diary, known as The Diary of Lady Murasaki (紫式部日記), in which she described the court life in Heian Japan in detail and the writing process of The Tale of Genji (源氏物語), the world's first novel. The diary itself is considered the prototype of "I novels", a genre that was revitalized in 20th century and has been popular in Japan till today.
AD 1009: February 14 or March 9 – The first known mention is made of the name of Lithuania, in connection with the murder of Bruno of Querfurt. He is beheaded and his 18 companions are hanged the same day during a mission among the Prussians in the Baltic region.
1010: The Second Goryeo-Khitan War — after a coup d'état in the Goryeo court killing King Mukjong (whom the Khitans had supported), the Khitan Empire invaded Goryeo and burned down its capital city Gaegyeong.
AD 1012: April 12 – Oldřich, Duke of Bohemia, deposes his brother Jaromír, who flees to Poland. Oldřich recognises the suzerainty of King Henry II of Germany over Bohemia. He secures his rule by suppressing the Vršovci insurgents.
AD 1013: The history encyclopedia Prime Tortoise of the Record Bureau, or Cefu Yuangui (冊府元龜), was completed. It was the last one of the "Four Great Books of Song". With 1,000 juan (chapters) and a word count of more than 9.39 million, it was the largest encyclopedia at the time.
AD 1014: February 14 – King Henry II arrives at Rome and is crowned Holy Roman Emperor together with his wife Cunigunde by Pope Benedict VIII in St. Peter's Basilica. Henry establishes the Diocese of Bobbio (Northern Italy) and returns to Germany.
AD 1016: Japanese poet Koshikibu no Naishi (lady-in-waiting to Dowager Empress Shōshi) and her husband Fujiwara no Kiminari (son of Michinaga) have a son, but the couple is not accepted because of the social gap between them.
AD 1017: Melus of Bari, a Lombard nobleman, revolts and is supported by Norman mercenaries at Capua. He marches into Apulia to catch the Byzantine army off-guard. Melus defeats the Byzantines on the banks of the Fortore River and ravages the territory in Apulia.
AD 1018: Battle of Dyrrhachium - The First Bulgarian Empire was conquered by the Byzantine Empire. The Byzantine ruler Basil II got the title Boulgaroktonos "slayer of Bulgarians" because of this.
AD 1020: The Fengguo Temple was constructed by the Khitan Empire. With an immense area and seven statues of Buddahs at the height of more than nine meters integrated, it is considered the greatest Chinese architecture in 11th century.
AD 1023: The Dom Church at Utrecht (modern Netherlands) is severely damaged by fire. Bishop Adalbold II begins construction of a new Romanesque style church.
AD 1029: March/April: The Ghaznavid Sultan Maḥmūd brutally sacks the city of Rayy after receiving a request for help by its Buyyid ruler Majd al-Dawla against his rebellious troops. He crucifies a large number of the local population and burns many books that he considers heretical.
AD 1030: Ouyang Xiu, a Chinese historian and scholar, obtained his jinshi degree at the age of 23, by passing the imperial examinations in the country, leading him to a distinguished path as a scholar-official.
AD 1031: July 20 – King Robert II (the Pious) dies at Melun, after a 35-year reign. He is succeeded by his 23-year-old son, Henry I, who becomes the sole ruler of France. Henry's mother, Queen dowager Constance of Arles, prefers her third son, Robert, as heir to the throne and, with the help of Count Odo II, begins a war against Henry.
AD 1032: Odo II, Count of Blois, invaded Burgundy and occupied most of its lands. However, in the same year he was later repelled by army of Konrad II, the Holy Roman Emperor.
AD 1033: December 5 – A major earthquake in the Jordan Valley devastates multiple cities across the Palestine region, killing many people and triggering a tsunami.
AD 1034: November 25 – King Malcolm II dies in battle at Glamis. He is succeeded by Duncan I, son of his eldest daughter, rather than Macbeth, who is possibly another grandson of his.
AD 1035: March 23 – Battle of Cesar (near the village of Cesar, Portugal): The armies of Bermudo III, King of León, defeat the Moorish armies of Abu'l-Qasim, the emir of the Taifa of Seville.