|Ab urbe condita||1882|
|Balinese saka calendar||1050–1051|
|English Regnal year||29 Hen. 1 – 30 Hen. 1|
|Chinese calendar||戊申年 (Earth Monkey)|
3825 or 3765
— to —
己酉年 (Earth Rooster)
3826 or 3766
|- Vikram Samvat||1185–1186|
|- Shaka Samvat||1050–1051|
|- Kali Yuga||4229–4230|
|Japanese calendar||Daiji 4|
|Minguo calendar||783 before ROC|
|Seleucid era||1440/1441 AG|
|Thai solar calendar||1671–1672|
1255 or 874 or 102
— to —
1256 or 875 or 103
|Wikimedia Commons has media related to 1129.|
- April 14 – Following the Capetian tradition, King Louis VI (the Fat) has his eldest son Philip crowned as co-ruler of France at Rheims Cathedral. Louis himself becomes the national protector of all France.
- June 2 – Fulk V, count of Anjou, marries Melisende (daughter of King Baldwin II) the heir to the Kingdom of Jerusalem. Fulk gives up his title which passes to his 15-year-old son, Geoffrey V (the Fair).
- September – Roger II of Sicily gains recognition as duke at Melfi from the Norman nobles of Naples, Bari, Capua, Salerno and other cities that have resisted him.
- Burgsteinfurt Castle is built in what is now Steinfurt (modern Germany).
- Jin–Song War: Emperor Gao Zong of the Song Dynasty moves the capital from Yangzhou to Hangzhou, after the Jurchen Jin Dynasty captures Kaifeng in the Jingkang Incident.
- March 26 – Gao Zong abdicates the throne after a mutiny of the palace guard. His 2-year-old son Zhao Fu succeeds him, but Empress Meng becomes regent and the sole ruler.
- April 20 – Gao Zong regains the throne (with the support of the imperial army led by General Han Shizhong). Zhao Fu is forced the abdicate with Meng having ruled for 25 days.
- July 24 – Former Emperor Shirakawa dies at his native Kyoto. His son Toba begins his cloistered rule, sharing power with Sutoku, a grandson of Shirakawa.
- January 23 – Henry of Blois becomes bishop of Winchester after the death of William Giffard (who was also Lord Chancellor to King Henry I) in England.
- January 23 – William Giffard, bishop of Winchester
- January 27 – Ranulf le Meschin, 3rd Earl of Chester (b. 1070)
- January 29 – Minamoto no Shunrai, Japanese poet (b. 1055)
- February 16 – Thoros I, Armenian prince (or 1130)
- February 17 – Constantine II, Armenian prince
- July 24 – Shirakawa, emperor of Japan (b. 1053)
- July 28 – Zhao Fu, emperor of the Song Dynasty (b. 1127)
- November 21 – Nigel d'Aubigny, Norman nobleman
- December 30 – Roger of Cannae, Italian bishop (b. 1060)
- Athanasius VI bar Khamoro, patriarch of Antioch
- Cellach of Armagh (or Celsus), Irish archbishop (b. 1080)
- Fujiwara no Akinaka, Japanese nobleman (b. 1059)
- John Theristus, Italian Benedictine monk (b. 1049)
- Ramiro Sánchez, Spanish nobleman (or 1130)
- Richard Fitz Pons, Norman nobleman (b. 1080)
- Walter FitzRoger, Norman sheriff of Gloucester
- Zhao Mingcheng, Chinese politician (b. 1081)
- Hammond, Peter W., ed. (1998), The Complete Peerage; or, A history of the House of lords and all its members from the earliest times, XIV: Addenda &, Corrigenda, Stroud: Sutton Publishing, p. 170, ISBN 978-0-904387-82-7 (Cited at thePeerage.com, which accessed 21 May 2019)CS1 maint: postscript (link)