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1143 in various calendars
Gregorian calendar	1143; MCXLIII
Ab urbe condita	1896
Armenian calendar	592; ԹՎ ՇՂԲ
Assyrian calendar	5893
Balinese saka calendar	1064–1065
Bengali calendar	549–550
Berber calendar	2093
English Regnal year	8 Ste. 1 – 9 Ste. 1
Buddhist calendar	1687
Burmese calendar	505
Byzantine calendar	6651–6652
Chinese calendar	壬戌年 (Water Dog); 3840 or 3633; — to —; 癸亥年 (Water Pig); 3841 or 3634
Coptic calendar	859–860
Discordian calendar	2309
Ethiopian calendar	1135–1136
Hebrew calendar	4903–4904
Hindu calendars
- Vikram Samvat	1199–1200
- Shaka Samvat	1064–1065
- Kali Yuga	4243–4244
Holocene calendar	11143
Igbo calendar	143–144
Iranian calendar	521–522
Islamic calendar	537–538
Japanese calendar	Kōji 2; (康治２年)
Javanese calendar	1049–1050
Julian calendar	1143; MCXLIII
Korean calendar	3476
Minguo calendar	769 before ROC; 民前769年
Nanakshahi calendar	−325
Seleucid era	1454/1455 AG
Thai solar calendar	1685–1686
Tibetan calendar	阳水狗年; (male Water-Dog); 1269 or 888 or 116; — to —; 阴水猪年; (female Water-Pig); 1270 or 889 or 117

Millennium:	2nd millennium
Centuries:	11th century; 12th century ; 13th century;
Decades:	1120s; 1130s; 1140s ; 1150s; 1160s;
Years:	1140; 1141; 1142; 1143 ; 1144; 1145; 1146;

Events

April 8 – Emperor John II (Komnenos) dies of a poisoned arrow wound while hunting wild boar on Mount Taurus in Cilicia. He is succeeded by his 24-year-old son Manuel I, who is chosen as his successor, in preference to his elder surviving brother Isaac. Manuel dispatches John Axouchos, his commander-in-chief (megas domestikos), to Constantinople ahead of him – with orders to arrest Isaac in the Great Palace.^[1]

November 13 – King Fulk of Jerusalem dies after a hunting accident in Acre. He is succeeded by his 13-year-old son Baldwin III – who is crowned as co-ruler alongside his mother, Queen Melisende on Christmas Day. Due to the political situation the Crusader States of Tripoli, Antioch and Edessa assert their independence. Raymond of Antioch demands the return of Cilicia to his principality and invades the province.^[2]

Spring – King Conrad III gives Bavaria to his half-brother Henry II (Jasomirgott). His wife, Gertrude (daughter of the late Emperor Lothair III) dies in childbirth at Klosterneuburg Monastery in Lower Austria on April 18.
October 5 – Treaty of Zamora: The Kingdom of Portugal is recognized by King Alfonso VII (the Emperor) of León and Castile in the presence of his cousin, King Afonso I of Portugal and papal representatives.
Adolf II, count of Schauenburg and Holstein, founds Lübeck – which later becomes one of the leading Hanseatic cities. He divides the conquered Slavic lands, as part of the eastward expansion in Germany.
Geoffrey V (the Fair) becomes Count of Anjou upon news of the death of his father Fulk.

July 1 – Battle of Wilton: Earl Robert of Gloucester (illegitimate son of the late King Henry I) defeats the English forces of King Stephen during a surprise attack at Wilton Abbey. In the darkness, Stephen escapes, while his steward William Martel fights a rearguard action to delay the pursuers.
Autumn – Stephen arrests Geoffrey de Mandeville, 1st Earl of Essex, during a meeting of the Royal Court at St. Albans. He is charged with treason against Stephen, but given his freedom back in return for surrendering his title and castles. Geoffrey becomes an outlaw and fortifies Ramsey Abbey, where he sets up his headquarters to plunder the countryside of Ely.

Norman raiders capture Jijel (modern Algeria).^[3] A Norman raid on Ceuta fails,^[4] but at the same time the Normans lead a successful assault against Sfax.^[5]

September 23 – Pope Innocent II dies at Rome after a 13-year pontificate. He is succeeded by Celestine II as the 165th pope of the Catholic Church.

^ Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, pp. 180–181. ISBN 978-0-241-29876-3.
^ Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, pp. 188–189. ISBN 978-0-241-29876-3.
^ Meynier, Gilbert (2010). L'Algérie cœur du Maghreb classique: De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte. p. 71.
^ Picard C. (1997). La mer et les musulmans d'Occident au Moyen Age. Paris: Presses Universitaires de France.
^ Bresc, Henri (2003). "La Sicile et l'espace libyen au Moyen Age" [Sicily and the Libyan space in the Middle Ages] (PDF). Africa: Rivista trimestrale di studi e documentazione dell'Istituto italiano per l'Africa e l'Oriente (in French). 63 (2): 187–208. JSTOR 25734500. Archived (PDF) from the original on October 9, 2022.