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|Centuries:||9th century – 10th century – 11th century|
|Decades:||950s 960s 970s – 980s – 990s 1000s 1010s|
|Years:||983 984 985 – 986 – 987 988 989|
|986 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1739|
|Bahá'í calendar||-858 – -857|
|English Regnal year||N/A|
|Chinese calendar||乙酉年 (Wood Rooster)
3682 or 3622
— to —
丙戌年 (Fire Dog)
3683 or 3623
|- Vikram Samvat||1042–1043|
|- Shaka Samvat||908–909|
|- Kali Yuga||4087–4088|
|Igbo calendar||-14 – -13|
|Japanese calendar||Kanna 2
|Minguo calendar||926 before ROC
|Thai solar calendar||1529|
|Wikimedia Commons has media related to 986.|
- March 2 – Louis V becomes King of the Franks.
- August 17 – Byzantine–Bulgarian wars: Battle of the Gates of Trajan – The Bulgarians defeat the Byzantine Empire forces at the Gate of Trajan near modern-day Ihtiman, with Byzantine Emperor Basil II barely escaping.
- The de facto ruler of al-Andalus, al-Mansur, continues his effort in the north of the Iberian peninsula, he takes and sacks Coimbra (following which the city is said to have remained deserted for six years).
- Sweyn Forkbeard becomes King of Denmark.
- Håkon Sigurdsson of Norway defeats the Danish invasion force at the Battle of Hjörungavágr.
- Emperor Ichijō succeeds Emperor Kazan on the throne of Japan.
- March–July – The Song Dynasty sends armies on three fronts against the Liao Dynasty in the Sixteen Prefectures, but are defeated on all fronts.(Chi go Pass Compaign)
- One of the Four Great Books of Song, the Chinese encyclopedia Finest Blossoms in the Garden of Literature is finished in this year, with a total of 1,000 volumes representing the work of some 2,200 authors.
- March 2 – Lothair, King of the Franks
- May 25 – 'Abd Al-Rahman Al Sufi, Muslim astronomer
- November 1 – Harold I of Denmark
- Cadwallon ab Ieuaf, King of Gwynedd
- Yang Ye, Chinese general of Song Dynasty