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|999 by topic|
|Ab urbe condita||1752|
|Balinese saka calendar||920–921|
|Chinese calendar||戊戌年 (Earth Dog)
3695 or 3635
— to —
己亥年 (Earth Pig)
3696 or 3636
|- Vikram Samvat||1055–1056|
|- Shaka Samvat||920–921|
|- Kali Yuga||4099–4100|
|Japanese calendar||Chōtoku 5 / Chōhō 1
|Minguo calendar||913 before ROC
|Seleucid era||1310/1311 AG|
|Thai solar calendar||1541–1542|
1125 or 744 or −28
— to —
1126 or 745 or −27
|Wikimedia Commons has media related to 999.|
- Fall – King Bermudo II abdicates in favor of his 5-year-old son Alfonso V as ruler of León. Moorish invaders have forced Bermudo to recognize the suzerainty of their leader, Umayyad vizier and the de facto ruler Al-Mansur.
- December 30 - Battle of Glenmama: The combined forces of Munster and Meath under Brian Boru (High King of Ireland) inflict a crushing defeat on the allied armies of Leinster and Dublin near Lyons Hill (County Kildare).
- The Karakhanids invade from north of the Syr Darya River which ends the Samanid Empire (modern Iran). The Samanid domains are split up between the Ghaznavid Dynasty and the Karakhanids.
- February 18 – Pope Gregory V dies after a 3-year pontificate in which he has been forced to flee Rome by the Cresenti family. He is succeeded by Sylvester II as the 139th pope of the Catholic Church.
- Bishop Aldhun consecrates a cathedral (later Durham Cathedral) at the location where the remains of St. Cuthbert are relocated. The remains from Lindisfarne are moved of the danger of Viking raids.
- Sigmundur Brestisson, a Viking chieftain, introduces Christianity in the Faroe Islands.
- April 11 – Bao Zheng, politician of the Song Dynasty (d. 1062)
- Berengar of Tours, French theologian (approximate date)
- Fujiwara no Ishi, Japanese empress consort (d. 1036)
- Odo of Rennes, duke and regent of Brittany (d. 1079)
- February 7 – Boleslaus II (the Pious), duke of Bohemia
- February 18 – Gregory V, pope of the Catholic Church
- June 11 – Ebergar (or Everger), archbishop of Cologne
- November 4 – Gregor von Burtscheid, German abbot
- November 29 – Li Chun'an, Chinese merchant (b. 921)
- December 16 – Adelaide, empress regent of the Holy Roman Empire (b. 931)
- Alfred of Malmesbury (or Aelfric), English abbot and writer
- Cao Bin, Chinese general and governor (jiedushi) (b. 931)
- Ceallach ua Maílcorgus, Irish chief poet of Connacht
- Maredudd ab Owain, king of Gwynedd (Wales) (approximate date)
- Matilda, German princess-abbess and daughter of Otto I (b. 955)
- Muirgheas mac Aedh, king of Uí Díarmata (Ireland)
- Subh of Córdoba, mother and regent of Hisham II
- Yelü Xiezhen, Chinese general and politician