986

Events

August 17 - Battle of the Gates of Trajan: Emperor Basil II leads a Byzantine expeditionary force against the Bulgarians to capture the fortress city of Sredets. After a siege of 20 days, Basil is forced to retreat from the Sofia Valley towards the town of Ihtiman. The Bulgarians under Tsar Samuel ambush and defeat the Byzantine forces. Only the elite Varangian Guard escapes with heavy casualties and leads Basil to safety through secondary routes.

March 2 - King Lothair III dies after a 32-year reign at Laon. He is succeeded by his 19-year-old son Louis V as ruler of the West Frankish Kingdom.
Summer: Al-Mansur, the de facto ruler of Al-Andalus, continues his effort in the north of the Iberian Peninsula and plunders the city of Coimbra.
Empress Theophanu, accompanied by the 6-year-old King Otto III and Henry II of Bavaria, leads a campaign against Bohemia and the Slavs on the Elbe frontier.
Mieszko I, duke ruler of Poland, pledges his allegiance to Otto III and the Holy Roman Empire. He promises assistance in Otto's war against the Slavs.
Battle of Hjörungavágr: The Earls of Lade under Haakon Sigurdsson defeat a Danish invasion force led by the Jomsvikings in western Norway.
Winter - King Harald II dies after a 28-year reign. He is succeeded by his son Sweyn Forkbeard as ruler of Denmark and Norway.

Winter - Sabuktigin, emir of the Ghaznavid Dynasty, invades India. He expands the emirate between the Kabul Valley and the Indus River after defeating King Jayapala.

Emperor Kazan abdicates the throne after a political struggle from the Fujiwara family. He is succeeded by his 6-year-old cousin Ichijō as the 66th emperor of Japan.
Summer - Chi Go Pass Campaign: The Song Dynasty sends armies on three fronts against the Liao Dynasty in the Sixteen Prefectures, but they are defeated on all fronts.

Bjarni Herjólfsson, a Norse-Icelandic merchant captain and explorer, becomes the first inhabitant of the Old World to discover the mainland of the Americas.