Winter of 1069–1070 – Harrying of the North: William I of England quells rebellions in the north of England, following an invasion by Sweyn II of Denmark. Widespread famine follows the devastation wrought.
Spring – King Sweyn II of Denmark joins English rebels, led by Hereward the Wake, and captures the Isle of Ely, in The Fens of eastern England.
April 11 – Archbishop of Canterbury Stigand is deposed.
June 1 – Hereward plunders Peterborough Abbey, in eastern England.
June – Denmark signs a treaty with England; Sweyn and his forces leave the country.
August 15 – The Pavian-born Benedictine Lanfranc is appointed as the new Archbishop of Canterbury in England.
An invasion of England by Malcolm III of Scotland is repelled.
Hugh d'Avranches, 1st Earl of Chester, the first Marcher Lord, invades Wales, capturing parts of Gwynedd.
A successful Byzantine counter-attack drives the Seljuq Turks across the Euphrates.
Bergen is founded by King Olaf III of Norway; it will function as the main city and capital of Norway, until it is replaced by Oslo in 1314.
Chinese Chancellor Wang Anshi starts the Xining Reforms (which last until 1085).
Jews from Rouen in Normandy settle in England, at the invitation of King William I.
The Temple of Literature, Hanoi, is established in the capital of Vietnam.
Uyghur poet Yusuf Khass Hajib of Balasagun, in the Kara-Khanid Khanate, completes the Kutadgu Bilig ("The Wisdom Which Brings Good Fortune"), and presents it to the prince of Kashgar.
Song dynasty Chinese astronomer, engineer, and statesman Su Song completes the compilation of the Ben Cao Tu Jing, a pharmaceutical treatise with related subjects of botany, zoology, mineralogy, and metallurgy.
Canterbury Cathedral in England is rebuilt, following a fire.
The rebuilding of York Minster in England begins.
Construction of Richmond Castle in North Yorkshire, England, by Alan Rufus begins.
Approximate date – Halsten Stenkilsson is deposed as king of Sweden, with Håkan the Red becoming king in Götaland, and Anund Gårdske being chosen as king of Svealand.
Hugues de Payens, Knight Templar (d. c. 1136)
Coloman, King of Hungary (d. February 3, 1116)
March 6 – Ulric I, Margrave of Carniola
July 17 – Baldwin VI, Count of Flanders (b. 1030)
Year 1070 (MLXX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.
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