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|Ab urbe condita||1856|
|Balinese saka calendar||1024–1025|
|English Regnal year||3 Hen. 1 – 4 Hen. 1|
|Chinese calendar||壬午年 (Water Horse)|
3799 or 3739
— to —
癸未年 (Water Goat)
3800 or 3740
|- Vikram Samvat||1159–1160|
|- Shaka Samvat||1024–1025|
|- Kali Yuga||4203–4204|
|Japanese calendar||Kōwa 5|
|Minguo calendar||809 before ROC|
|Seleucid era||1414/1415 AG|
|Thai solar calendar||1645–1646|
1229 or 848 or 76
— to —
1230 or 849 or 77
|Wikimedia Commons has media related to 1103.|
- Spring – Bohemond I, Norman prince of Antioch, is released from Seljuk imprisonment at Niksar after a ransom is paid of 100,000 gold pieces. During his absence, Tancred (Bohemond's nephew) attacks the Byzantines and re-capture the cities of Tarsus, Adana and Mamistra in Cilicia. Tancred is deprive of his lordship by Bohemond's return, and is rewarded with a small fief within the Principality of Antioch.
- The Crusaders under Raymond IV (Saint-Gilles) invade the Beqaa Valley and capture Tortosa to isolate Tripoli. Raymond expands towards the Orontes River, and begins to build a castle on the Mons Peregrinus ("Pilgrim's Mountain") which helps in the Siege of Tripoli (see 1102). Emperor Alexios I (Komnenos) supports the Crusaders by sending a Byzantine fleet (ten ships) to blockade the port of Tripoli.
- Summer – The Crusaders led by Bohemond I and Joscelin of Courtenay raid the territory of Aleppo to gain supplies. They capture the town of Muslimiyah, and extract a large tribute. Sultan Fakhr al-Mulk Radwan, the Seljuk ruler of Aleppo, agrees to pay 7,000 gold pieces and ten horses to the Crusaders while Bohemond agrees to release all Seljuk prisoners captured at Muslimiyah.
- August 24 – King Magnus III (Barefoot) is killed in battle with the Ulaid in Ulster. Sigurd Jorsalfare, Øystein Magnusson and Olaf Magnusson succeed him as joint kings of Norway.
- April 27 – Anselm, archbishop of Canterbury, goes again in exile after a dispute with King Henry I over the appointment of bishops and abbots into important Church positions.
- August 5 – Queen Matilda of Scotland, wife of Henry I, gives birth to their first son William Adelin at Winchester. They already have a daughter, Princess Matilda (or Maude).
- Li Jie, Chinese government minister, publishes his Yingzao Fashi technical treatise on Chinese architecture, during the reign of Emperor Hui Zong of the Song Dynasty.
- February 24 – Toba, emperor of Japan (d. 1156)
- March 24 – Yue Fei, Chinese general and poet (d. 1142)
- August 5 – William Adelin, duke of Normandy (d. 1120)
- Adeliza of Louvain (or Adelicia), queen of England (d. 1151)
- Aénor de Châtellerault, duchess of Aquitaine (d. 1130)
- Alfonso I, count of Tripoli and Toulouse (d. 1148)
- Henry II, margrave of the Saxon Ostmark (d. 1123)
- Rögnvald Kali Kolsson, Norwegian earl (d. 1158)
- Wivina, French Benedictine abbess (d. 1168)
- January 17 – Frutolf of Michelsberg, German monk
- March 18 – Sybilla of Conversano, Norman duchess
- July 10 – Eric I (the Good), king of Denmark
- August 24 – Magnus III (Barefoot), king of Norway (b. 1073)
- October 19 – Humbert II (the Fat), count of Savoy (b. 1065)
- Al-Hakim al-Munajjim, Persian Nizari missionary
- Boedil Thurgotsdatter (or Bodil), Danish queen
- Ebles II, French nobleman (House of Montdidier)
- Henry I (the Elder), German nobleman (House of Wettin)
- Isaac Alfasi, Algerian Talmudist and posek (b. 1013)
- Manegold of Lautenbach, German priest (b. 1030)
- Osbern FitzOsbern, bishop of Exeter (b. 1032)
- Sibylla of Burgundy, duchess of Burgundy (b. 1065)
- William Firmatus, Norman hermit and pilgrim (b. 1026)
- Steven Runciman (1951). A History of the Crusades. Vol II: The Kingdom of Jerusalem, pp. 31–32. ISBN 978-0-241-29876-3.
- Steven Runciman (1951). A History of the Crusades. Vol II: The Kingdom of Jerusalem, pp. 47–48. ISBN 978-0-241-29876-3.
- Steven Runciman (1951). A History of the Crusades. Vol II: The Kingdom of Jerusalem, p. 32. ISBN 978-0-241-29876-3.