Year 999 (CMXCIX) was a common year of the Julian Calendar. Events By place Europe Silesia's incorporated into territory ruled by Boleslaus I of Poland. The Orsay commune's founded. By topic Religion 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's adopted in Iceland. Births Bao Qingtian, Chinese magistrate and mayor of Kaifeng (d. 1062) Deaths… (More on 999)