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|Centuries:||11th century – 12th century – 13th century|
|Decades:||1110s 1120s 1130s – 1140s – 1150s 1160s 1170s|
|Years:||1145 1146 1147 – 1148 – 1149 1150 1151|
|1148 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1148 in poetry|
|Ab urbe condita||1901|
|Bahá'í calendar||−696 – −695|
|English Regnal year||13 Ste. 1 – 14 Ste. 1|
|Chinese calendar||丁卯年 (Fire Rabbit)
3844 or 3784
— to —
戊辰年 (Earth Dragon)
3845 or 3785
|- Vikram Samvat||1204–1205|
|- Shaka Samvat||1070–1071|
|- Kali Yuga||4249–4250|
|Japanese calendar||Kyūan 4
|Minguo calendar||764 before ROC
|Thai solar calendar||1691|
|Wikimedia Commons has media related to 1148.|
- Taking advantage of internal strife and of a famine episod, George of Antioch takes Mahdiya (June 22), Susa (July 1) and Sfax (July 12) in Tunisia in the name of Roger II of Sicily.
- The Anglo-Flemish crusader fleet takes Oran.
- Following the uprising of other cities of the region (Meknes, Sijilmassa) under al-Massati, the population of Ceuta rebels against the Almohads.
- Saif-ud-din of Ghor defeats Bahram Shah at the Battle of Ghazni.
- Siege of Damascus by the Second Crusade:
- Anna Comnena writes the Alexiad, which is a biography of her father, Emperor Alexius I.
- King Afonso I of Portugal takes Abrantes from the Moors.
- December 30 – Ramon Berenguer IV, Count of Barcelona conquers Tortosa from the Moors.
- January 6 – Gilbert de Clare, 1st Earl of Pembroke (b. 1100)
- January 8 – William de Warenne, 3rd Earl of Surrey
- April – Amadeus III of Savoy (b. 1095)
- August 21 – William II, Count of Nevers (b. c. 1089)
- September 17 – Conan III, Duke of Brittany (b. 1070)
- November 2 – Saint Malachy (b. 1094)
- date unknown – Alphonse I of Toulouse, Count of Toulouse (b. 1103)
- Abulafia, David (1985). The Norman kingdom of Africa and the Norman expeditions to Majorca and the Muslim Mediterranean. Woodbridge: Boydell Press. ISBN 0-85115-416-6.
- Picard C. (1997) La mer et les musulmans d'Occident au Moyen Age. Paris: Presses Universitaires de France, pp.73
- McGrank, Lawrence (1981). "Norman crusaders and the Catalan reconquest: Robert Burdet and te principality of Tarragona 1129-55". Journal of Medieval History 7 (1): 67–82.