|1128 in topic|
|Political entities - State leaders - Religious leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1128 in poetry|
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- Champa invades Vietnam.
- Jin–Song Wars: Song Dynasty China establishes a temporary capital at Yangzhou, while the government retreats south, after the Jurchen Jin Dynasty captured their previous capital of Kaifeng, in the Jingkang Incident.
- June 17 – Geoffrey of Anjou marries Matilda, daughter of Henry I of England.
- June 24 – Battle of São Mamede: Afonso I of Portugal (then Count of Portugal) defeats his mother, Teresa of León, and gains control of the county, which thus becomes de facto independent.
- July 27 – The city of Bruges is founded.
- King Louis VI of France agrees to the accession of Thierry of Alsace, as Count of Flanders.
- Byzantine Emperor John II Komnenos defeats the Magyars near Haram, on the Danube River.
- Kelso Abbey is founded by David I of Scotland.
- Pope Honorius II recognizes and confirms the Order of the Knights Templar. Bernard of Clairvaux codifies the rule of the order.
- Holyrood Abbey is founded in Edinburgh by David I, King of Scotland.
- Absalon, Danish archbishop and statesman
- Alain de Lille, French theologian and poet (approximate date; d. 1202)
- Archbishop William of Tyre, historian of the Crusades (approximate date; d. 1186)
- Constance of Hauteville, Sovereign Princess of Antioch (d. 1163)