1128

Year 1128 (MCXXVIII) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar.

Byzantine Empire

 * Byzantine–Hungarian War: Emperor John II (Komnenos) defeats the Hungarians and their Serbian allies at the fortress of Haram (or Chramon), which is modern-day Nova Palanka.

Europe

 * June 24 – Battle of São Mamede: Count Alfonso I (Henriques) defeats the forces led by his mother, Queen Theresa of Portugal, near Guimarães, and gains control of the county. Alfonso styles himself "Prince of Portugal".
 * June 29 – Conrad III, anti-king of Germany, is crowned "King of Italy" by Archbishop Anselmo della Pusterla at Monza in Lombardy.
 * July 27 – The city of Bruges (modern Belgium) is founded. It receives its city charter – as well new walls and canals are built.
 * Pope Honorius II invests Roger II of Sicily as duke of Apulia at Benevento, after his failure to form an coalition against Roger.
 * King Louis VI (the Fat) of France agrees to the accession of Thierry of Alsace (or Theoderic), as count of Flanders.

England

 * June 17 – King Henry I marries his only legitimate daughter, dowager Empress Matilda, to the 14-year-old Geoffrey V (the Fair), count of Anjou.

Britain

 * Hugues de Payens, French Grand Master of the Order of the Knights Templar, visits both England and Scotland, where he raises men and money for the Order.

Asia

 * Jin–Song War: Emperor Gao Zong of the Song Dynasty establishes a new capital at Yangzhou, while the government retreats south, after Jurchen forces capture the previous capital of Kaifeng, in the Jingkang Incident.
 * Forces of the Kingdom of Champa invade Vietnam.

Religion

 * November 24 – Waverley Abbey is founded by Bishop William Giffard. The first abbot and 12 Cistercian monks are brought from L'Aumône Abbey in Normandy.
 * Honorius II recognizes and confirms the Order of the Knights Templar. The French abbot Bernard of Clairvaux codifies the rule of the Order.
 * Holyrood Abbey is founded in Edinburgh by King David I of Scotland.
 * Kelso Abbey is founded by Scottish monks of the Tironensian Order.

Births

 * March 18 – Stephen of Tournai, French bishop (d. 1203)
 * Absalon, Danish archbishop and statesman (d. 1201)
 * Adolf II, count of Schauenburg and Holstein (d. 1164)
 * Alain de Lille, French theologian and poet (approximate date)
 * Ali ibn Muhammad ibn al-Walid, Arab theologian (d. 1215)
 * Constance of Hauteville, princess of Antioch (d. 1163)
 * John Doukas (Komnenos), Byzantine governor (d. 1176)
 * John Kontostephanos, Byzantine aristocrat (approximate date)
 * Lorcán Ua Tuathail, Irish archbishop of Dublin (d. 1180)
 * Ludwig II (the Iron), landgrave of Thuringia (d. 1172)
 * Muhammad II ibn Mahmud, Seljuk sultan (d. 1159)
 * Ruzbihan Baqli, Persian poet and mystic (d. 1209)
 * Taira no Norimori, Japanese nobleman (d. 1185)

Deaths

 * January 1 – Albero I, prince-bishop of Liège (b. 1070)
 * February 12 – Toghtekin, Turkish ruler of Damascus
 * June 2 – Pier Leoni (or Petrus Leo), Roman consul
 * July 20 – Al-Ma'mun al-Bata'ihi, Fatimid vizier (b. c. 1086)
 * July 28 – William Clito, count of Flanders (b. 1102)
 * September 5 – Ranulf Flambard, bishop of Durham
 * December 4 – Henry II, German nobleman (b. 1102)
 * December 15 – Fulco I d'Este, Lombard nobleman
 * Abu Ibrahim ibn Barun, Andalusian Jewish rabbi
 * Conaing Ua Beigléighinn, Irish monk and abbot
 * Constantine I of Torres, ruler (judge) of Logudoro
 * Fujiwara no Kiyohira, Japanese nobleman (b. 1056)
 * Geoffrey Brito (or le Breton), archbishop of Rouen
 * Ibn Tumart, Almoravid political leader (or 1130)
 * Jimena Muñoz (or Muñiz), Spanish noblewoman
 * Rogvolod Vseslavich (Boris), prince of Polotsk
 * Warmund (or Gormond), patriarch of Jerusalem