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.|
- February 11 – Battle of Welfesholz: Lothair of Supplinburg defeats Henry V, Holy Roman Emperor.
- February 13 (traditional date) – Clairvaux Abbey is founded in France, by Bernard.
- September 14 – Battle of Sarmin in Syria: Roger of Salerno's Crusaders rout the Seljuk Turks, under Bursuq ibn Bursuq.
- Anselm of Laon becomes archdeacon of Laon.
- Peter Abélard becomes canon of Notre Dame de Paris, and meets Héloïse d'Argenteuil.
- Stephen of England becomes count of Mortain.
- Arnulf of Chocques is accused of sexual relations with a Muslim woman, and is briefly removed from his position as Latin Patriarch of Jerusalem, by the papal legate.
- Jurchen people establish the Jin dynasty of China.
- The Crusader castle of Montreal is built by Baldwin I of Jerusalem, in Jordan.
- The Mixtec lord Eight Deer Jaguar Claw is defeated in battle, and sacrificed by a coalition of city-states, led by his brother-in-law 4 Wind, at Tilantongo.
- Earliest likely date – Hugh of Saint Victor joins the Victorines in Paris, France.
- July 24 – Matilda, Countess of Tuscany (b. 1046)
- November 8 – Godfrey of Amiens, bishop of Amiens and Catholic saint
- December 22 – Olaf Magnusson, King of Norway (b. 1099)
- December 30 – Theodoric II, Duke of Lorraine
- date unknown