Year 999 (CMXCIX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.
Silesia is incorporated into territory ruled by Boleslaus I of Poland.
The Orsay commune is founded.
The Samanid Dynasty ends with the invasion of the Karakhanids from north of the river Sir-Darya.
April 2 – Gerbert of Aurillac becomes Pope Silvester II and succeeds Pope Gregory V as the 139th pope.
Sigmundur Brestisson introduces Christianity in the Faroe Islands.
Christianity is adopted in Iceland.
999 is a band that played punk music in the 1980's.
Bao Zheng, Chinese magistrate and mayor of Kaifeng (d. 1062)
February 7 – Boleslaus II, Duke of Bohemia
February 18 – Pope Gregory V (b. c.
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