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This article is about the year 1157.
|Centuries:||11th century – 12th century – 13th century|
|Decades:||1120s 1130s 1140s – 1150s – 1160s 1170s 1180s|
|Years:||1154 1155 1156 – 1157 – 1158 1159 1160|
|1157 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1157 in poetry|
|Ab urbe condita||1910|
|English Regnal year||3 Hen. 2 – 4 Hen. 2|
|Chinese calendar||丙子年 (Fire Rat)
3853 or 3793
— to —
丁丑年 (Fire Ox)
3854 or 3794
|- Vikram Samvat||1213–1214|
|- Shaka Samvat||1079–1080|
|- Kali Yuga||4258–4259|
|Japanese calendar||Hōgen 2
|Minguo calendar||755 before ROC
|Seleucid era||1468/1469 AG|
|Thai solar calendar||1699–1700|
|Wikimedia Commons has media related to 1157.|
- January 12–March 16 – Caliph Al-Muqtafi successfully defended Baghdad against the coalition forces of Sultan Muhammad of Hamadan, and Atabeg Qutb-adin of Mosul.
- Albert I of Brandenburg begins his ruthless program to pacify the Slavic region.
- June 11 – Albert I of Brandenburg, also called, The Bear (Ger: Albrecht der Bär), becomes the founder of the Margraviate of Brandenburg, Germany and the first Margrave.
- August 21 – Sancho III and Ferdinand II, the sons of King Alfonso VII of Castile, divide his kingdom between them upon his death.
- October 23 – Battle of Grathe Heath: A civil war in Denmark ends with the death of King Sweyn III. Valdemar I of Denmark becomes king of all Denmark and restores and rebuilds the country.
- Henry II of England grants a charter to the merchants of Lincoln (approximate date).
- Henry II of England invades Wales and is defeated at the Battle of Ewloe by Owain Gwynedd.
- Nur ad-Din Zengi besieged the Knights Hospitaller in the crusader fortress of Banyas, routed a relief army led by King Baldwin III of Jerusalem, and took Grand Master Bertrand de Blanquefort prisoner.
- September 8 – King Richard I of England (d. 1199)
- Alexander Neckham (d. 1217)
- Leopold V of Austria (d. 1194)
- January 25 – Agnes of Babenberg, daughter of Leopold III of Austria (b. 1111)
- May 8 – Ahmed Sanjar, Great Seljuk Sultan (b. 1084 or 1086)
- May 15 – Yury Dolgoruky, Russian prince (b. c. 1099)
- August 21 – King Alfonso VII of Castile (b. 1105)
- October 23 – King Sweyn III of Denmark (b. c. 1125) (in battle)
- date unknown – King Eystein II of Norway (b. c. 1125)