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|1091 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1844|
|Balinese saka calendar||1012–1013|
|English Regnal year||4 Will. 2 – 5 Will. 2|
|Chinese calendar||庚午年 (Metal Horse)|
3787 or 3727
— to —
辛未年 (Metal Goat)
3788 or 3728
|- Vikram Samvat||1147–1148|
|- Shaka Samvat||1012–1013|
|- Kali Yuga||4191–4192|
|Japanese calendar||Kanji 5|
|Minguo calendar||821 before ROC|
|Seleucid era||1402/1403 AG|
|Thai solar calendar||1633–1634|
1217 or 836 or 64
— to —
1218 or 837 or 65
|Wikimedia Commons has media related to 1091.|
- Spring – Tzachas, an Seljuk Turkish military commander, establishes a independent maritime state centred in the Ionian coastal city of Smyrna (modern-day İzmir). He proclaims himself emperor (basileus) and concludes an alliance with the Pechenegs in Thrace. Tzachas uses his fleet to blockade Constantinople by sea, while the Pechenegs besiege the capital by land.
- April 29 – Battle of Levounion: Emperor Alexios I supported by his allies defeats the Pechenegs 80,000 men (including women and children) at the Evros River near Enos (modern Turkey). The Cumans and Byzantine forces fall upon the enemy camp, slaughtering all in their path. The Pechenegs are butchered savagely that they are almost wiped out.
- Spring – King Stephen II, the last member of the Trpimirović Dynasty, dies without leaving an heir after a 2-year reign. War and unrest breaks out in Croatia afterwards. King Ladislaus I of Hungary, on instigation of his sister, Queen Helena, intervenes in the conflict and occupies Croatia. He proclaims himself king, but is contested by the Croatian nobleman Petar Snačić.
- February – Norman conquest of Sicily: The Normans conquer Noto and complete the 30-year-long conquest of Sicily from the Moorish rulers. Duke Roger Borsa (a son of Robert Guiscard) surrenders his share in the castles of Calabria, and receives his inheritance of Palermo. He grants charters to various towns and encourages urban planning in Apulia and Calabria.
- Summer – The Norman invasion of Malta: A Norman fleet led by Count Roger I (Bosso) arrives in Malta. Roger disembarks his army, and besieges the island's capital Medina (modern-day Mdina). The inhabitants negotiate peace terms (by promising paying an annual tribute) and swear an oath of loyalty to Roger. On the way back, the Normans sack the island Gozo.
- July – The Abbadid Dynasty ruling in Al-Andalus (modern Spain) falls, when the Almoravid forces storm Seville. Confronted with this threat, Emir Muhammad ibn Abu Bakr Muhammad al-Aftas of Badajoz obtains the support of King Alfonso VI (the Brave) of Castile, in exchange for the Moorish positions on the Tagus River (Sintra, Santarém and Lisbon).
- Spring – King William II invades Normandy with a large army. His brothers, Henry and Robert Curthose, mobilizes mercenary forces to resist William during the siege at Mont-Saint-Michel. Henry is forced to surrender his estates of the Cotentin Peninsula in Normandy and signs a peace treaty.
- Summer – King Malcolm III of Scotland invades the north of England, and besieges Durham. The Normans led by William II marches north to oppose the Scots, but a conflict is averted. Malcolm is forced to accept the terms of the Treaty of Abernethy (see 1072) and pays homage to William.
- Cardiff Castle is constructed by Robert Fitzhamon, Norman lord of Gloucester (approximate date).
- October 17 – London tornado: A T8 tornado (roughly equal to an T4 tornado) occurs in London. The wooden London Bridge is demolished and the church of St. Mary-le-Bow is badly damaged.
- December – Athanasius VI bar Khamoro becomes (against his will) patriarch and head of the Syriac Orthodox Church in Antioch (until 1129).
- September 18 – Andronikos Komnenos, Byzantine prince and general
- December 22 – Jutta von Sponheim, German abbess (d. 1136)
- Hongzhi Zhengjue, Chinese Chan Buddhist monk and writer (d. 1157)
- Matilda of Rethel, French noblewoman and sovereign (d. 1151)
- Wartislaw I (or Warcisław), duke of Pomerania (approximate date)
- March 26 – Wallada bint al-Mustakfi, Andalusian female poet (b. 994)
- June 17 – Dirk V, count of Friesland (west of the Vlie) (b. 1052)
- June 29 – Frederick of Montbéliard, margrave of Turin
- July 5 – William of Hirsau, German abbot and music theorist
- August 8 – Altmann of Passau, German bishop and saint
- August 25 – Sisnando Davides, Mozarab military leader
- December 19
- Fu Yaoyu, Chinese government official and politician (b. 1024)
- Helena of Hungary, queen of Croatia (approximate date)
- Jordan I (or Giordano), Italo-Norman prince of Capua
- Mac meic Aedh Ua Flaithbheartaigh, king of Iar Connacht
- Robert D'Oyly, Norman nobleman (approximate date)
- Stephen II (or Stjepan), king of Croatia (approximate date)
- Wolfhelm of Brauweiler, German Benedictine abbot
- Zaheer-ul-Daulah Artuk Beg, Seljuk general and governor