|Covid-19|The troops of Roger II of Sicily take Djerba.
The Hammadid emirate launches an assault against Mahdia in Ifriqiya.
Song dynasty Chinese general Yue Fei defeats the rebel forces of Yang Yao by entangling his swift paddle-wheel ships with rotten logs and other debris precariously placed in the river. Yue Fei's forces easily board their ships and win a victory.
The domination of Baghdad by the Seljuk Turks ends.
May 26 – Alfonso VII of León and Castile is crowned in the Cathedral of Leon as Imperator totius Hispaniae, "Emperor of All the Spains".
10 August - Battle at Konungahella
December 1 – Stephen succeeds his uncle Henry I as king of England. Matilda, daughter of Henry I and widow of Holy Roman Emperor Henry V, opposes Stephen and claims the throne as her own.
The first records of the Manor of Cramlington come into existence.
A fire in London seriously damages St Paul's Cathedral and London Bridge on Pentecost (Sunday, May 26).
The Pisans, in the service of the Holy See, sack the city of Amalfi.
The Republic of Florence keeps expending its control over its surrounding countryside and conquers the neighboring city of Montebuoni.
A Moorish fleet raids the Catalan port-town of Elna.
January – Byland Abbey is founded.
The Cistercian Abbey of St. Mary and St. Chad is founded by Roger de Clinton, bishop of Coventry (1129–48).
Petronila of Aragon, daughter of Ramiro II of Aragon (d. 1174)
William of Newburgh, English historian and monk (d. 1198)
Peter of Blois, French poet and diplomat (d. 1203)
Joachim of Fiore, Italian mystic and theologian (d. 1201)
Maimonides, Spanish philosopher, rabbi, and physician (d. 1204)
Sharafeddin Tusi, Persian mathematician (d. 1213)
June 4 – Emperor Huizong of China (b. 1082)
August 29 – Al-Mustarshid, Caliph of Baghdad
December 1 – King Henry I of England
Milarepa, Tibetan yogi and poet (b. 1052)
Yuanwu Keqin, Chinese Zen Buddhist monk (b. 1063)
Year 1135 (MCXXXV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.