This article relies largely or entirely on a single source. (March 2019)
|Ab urbe condita||1868|
|Balinese saka calendar||1036–1037|
|English Regnal year||15 Hen. 1 – 16 Hen. 1|
|Chinese calendar||甲午年 (Wood Horse)|
3811 or 3751
— to —
乙未年 (Wood Goat)
3812 or 3752
|- Vikram Samvat||1171–1172|
|- Shaka Samvat||1036–1037|
|- Kali Yuga||4215–4216|
|Japanese calendar||Eikyū 3|
|Minguo calendar||797 before ROC|
|Seleucid era||1426/1427 AG|
|Thai solar calendar||1657–1658|
1241 or 860 or 88
— to —
1242 or 861 or 89
|Wikimedia Commons has media related to 1115.|
- September 14 – Battle of Sarmin: The Crusaders, under Prince Roger of Salerno, surprise and rout the Seljuk Turkish army (some 8,000 men), led by Emir Bursuq ibn Bursuq, at Sarmin (modern Syria). Bursuq barely avoids capture, and escapes with a few hundred horseman. Roger reoccupies the fortress of Kafartab, and consolidates his territory around Antioch.
- The Crusader castle of Montréal (located in Jordan) is commissioned by King Baldwin I of Jerusalem, during an expedition against the Seljuk Turks.
- February 11 – Battle of Welfesholz: Duke Lothair of Supplinburg joins the rebellious Saxon forces, and defeats the German Imperial Army of Emperor Henry V at Welfesholz, in Saxony-Anhalt (modern Germany).
- July 24 – Matilda, margravine of Tuscany, dies at Bondeno. During her reign she waged an intermittent war with the late Emperor Henry IV, over the inheritance rights of her fiefs in Lombardy and Tuscany.
- The Jin Dynasty (or Great Jin) is created by the Jurchen tribal chieftain Taizu (or Aguda). He establishes a dual-administration system: a Chinese-style bureaucracy to rule over northern and northeast China.
- The 19-year-old Minamoto no Tameyoshi, Japanese nobleman and samurai, gains recognition by suppressing a riot against Emperor Toba at a monastery near Kyoto (approximate date).
- The Mixtec ruler Eight Deer Jaguar Claw (or 8 Deer) is defeated in battle and sacrificed by a coalition of city-states, led by his brother-in law 4 Wind, at Tilantongo in the Mixteca Alta region (modern Mexico).
- Arnulf of Chocques is accused of sexual relations with a Muslim woman. He is briefly removed from his position as patriarch of Jerusalem.
- Peter Abelard, French scholastic philosopher, becomes master of the cathedral school of Notre-Dame and meets Héloïse d'Argenteuil.
- Clairvaux Abbey is founded by Bernard, French abbot and a major leader in the reform of Benedictine monasticism, in France.
- Hugh of Saint Victor, French theologian and writer, joins the Victorines (at the Augustinian Abbey of St. Victor) in Paris.
- April 18 – Gertrude, German duchess and regent (d. 1143)
- September 18 – Wu, Chinese empress consort (d. 1197)
- Aubrey de Vere, 1st Earl of Oxford (approximate date)
- Berenguer Raymond, count of Provence (d. 1144)
- Erling Skakke, Norwegian nobleman (approximate date)
- Eustathius of Thessalonica, Byzantine archbishop (d. 1195)
- Euthymios Malakes, Byzantine bishop (approximate date)
- Fulk I FitzWarin (or Fulke), English nobleman (d. 1170)
- Gilbert FitzRichard de Clare, 1st Earl of Hertford (d. 1152)
- Hugo Etherianus, Italian cardinal and adviser (d. 1182)
- Li Tao (or Renfu), Chinese historian and writer (d. 1184)
- Magnus IV (the Blind), king of Norway (approximate date)
- Pedro Fernández de Castro, Spanish nobleman (d. 1184)
- Peter Cellensis, French abbot and bishop (d. 1183)
- Roger de Pont L'Évêque, Norman archbishop (d. 1181)
- Welf VI, margrave of Tuscany (House of Welf) (d. 1191)
- Wichmann von Seeburg, German archbishop (d. 1192)
- William V (the Old), marquess of Montferrat (d. 1191)
- April 16 – Magnus Erlendsson, Earl of Orkney (b. 1080)
- July 8 – Peter the Hermit, French religious leader
- July 24 – Matilda, margravine of Tuscany (b. 1046)
- December 22 – Olav Magnusson, king of Norway (b. 1099)
- December 23 – Ivo of Chartres, French bishop (b. 1040)
- December 30 – Theodoric II, duke of Lorraine
- Abu al-Mu'in al-Nasafi, Arab theologian (or 1114)
- Adela of Flanders, queen of Denmark (b. 1064)
- Artau II, count of Pallars Sobirà (approximate date)
- Eight Deer Jaguar Claw, Mixtec ruler (b. 1063)
- Gerberga (or Gerburge), countess of Provence
- Godfrey of Amiens, French bishop (b. 1066)
- Leo Marsicanus, Italian cardinal (b. 1046)
- Mazdali ibn Tilankan, Almoravid governor
- Odo II (or Eudes), count of Champagne
- Reynelm (or Reinelm), bishop of Hereford
- Shin Arahan, Burmese religious adviser
- Tanchelm of Antwerp, Flemish priest
- Turgot of Durham, Scottish bishop
- Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, pp. 106–107. ISBN 978-0-241-29876-3.
- Comyn, Robert (1851). History of the Western Empire from its Restoration by Charlemagne to the Accession of Charles V, p. 181.
- Pohl, John M.D. (2002). The Legend of Lord Eight Deer: An Epic of Ancient Mexico. Oxford; New York: Oxford University Press. ISBN 978-0-19-514019-4. OCLC 47054677.
- "Matilda of Canossa | countess of Tuscany". Encyclopedia Britannica. Retrieved March 18, 2019.