Millennium:	2nd millennium
Centuries:	11th century 12th century 13th century
Decades:	1140s 1150s 1160s 1170s 1180s
Years:	1163 1164 1165 1166 1167 1168 1169

1166 by topic
Leaders
Political entities State leaders Religious leaders
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments
Art and literature
1166 in poetry
v t e

1166 in various calendars
Gregorian calendar	1166 MCLXVI
Ab urbe condita	1919
Armenian calendar	615 ԹՎ ՈԺԵ
Assyrian calendar	5916
Balinese saka calendar	1087–1088
Bengali calendar	573
Berber calendar	2116
English Regnal year	12 Hen. 2 – 13 Hen. 2
Buddhist calendar	1710
Burmese calendar	528
Byzantine calendar	6674–6675
Chinese calendar	乙酉年 (Wood Rooster) 3863 or 3656 — to — 丙戌年 (Fire Dog) 3864 or 3657
Coptic calendar	882–883
Discordian calendar	2332
Ethiopian calendar	1158–1159
Hebrew calendar	4926–4927
Hindu calendars
- Vikram Samvat	1222–1223
- Shaka Samvat	1087–1088
- Kali Yuga	4266–4267
Holocene calendar	11166
Igbo calendar	166–167
Iranian calendar	544–545
Islamic calendar	561–562
Japanese calendar	Eiman 2 / Nin'an 1 (仁安元年)
Javanese calendar	1073–1074
Julian calendar	1166 MCLXVI
Korean calendar	3499
Minguo calendar	746 before ROC 民前746年
Nanakshahi calendar	−302
Seleucid era	1477/1478 AG
Thai solar calendar	1708–1709
Tibetan calendar	阴木鸡年 (female Wood-Rooster) 1292 or 911 or 139 — to — 阳火狗年 (male Fire-Dog) 1293 or 912 or 140

Year 1166 (MCLXVI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

Events

Emperor Manuel I (Komnenos) asks Venice to help pay the costs of defending Sicily, whose Norman rulers have had good relations with Venice. Doge Vitale II Michiel refuses to pay the requested subsidy. Manuel begins to cultivate relationships with the main commercial rivals of Venice: Genoa and Pisa. He grants them their own trade quarters in Constantinople, very near the Venetian settlements.

May 7 – King William I (the Wicked) of Sicily dies at Palermo after a 12-year reign. He is succeeded by his 12-year-old son William II (the Good), whose mother, Margaret of Navarre, will be regent until he comes of age.
Battle of Pantina: The Byzantines intervene on behalf of Grand Prince Tihomir of Serbia against his rebellious brother, Prince Stefan Nemanja, who defeats the Byzantine forces and becomes Grand Župan of Serbia.
Henry the Lion, duke of Saxony, has the Brunswick Lion created at Dankwarderode Castle in Braunschweig (modern Germany). Mentioned by Albert of Stade, a German abbot and chronicler, as the year of origin.
July 5 – The town of Bad Kleinkirchheim (modern Austria) is first mentioned, in an ecclesiastical document, in which Archbishop Conrad II of Salzburg confirms the donation of a chapel, nearby Millstatt Abbey.
Autumn – Emperor Frederick I (Barbarossa) begins his fourth Italian campaign, hoping to secure the claim of Antipope Paschal III in Rome and the coronation of his wife Beatrice I as Holy Roman Empress.
Mieszko III (the Old) proclaims a Prussian crusade against the pagans and pressures the collaboration of Frederick I. He leaves Greater Poland in the hands of his younger brother Casimir II (the Just).

Diarmaid mac Murchadha is exiled and goes to Normandy, and the court of King Henry II to ask for assistance in retaking his kingdom. Henry gives him permission to find a willing army from either England or Wales.
Richard de Clare (Strongbow), 2nd Earl of Pembroke, and his half-brothers Robert FitzStephen and Maurice FitzGerald, agree to help Diarmaid mac Murchadha in return for Diarmaid's daughter's hand in marriage.
Cartae Baronum ("Charters of the Barons"), a survey commissioned by the Treasury requiring each baron to declare how many knights he had enfeoffed.
Summer – Henry II invades and conquers Brittany to punish the local Breton barons. He grants the territory to his 7-year-old son Geoffrey.^[1]
Henry II enacts the Assize of Clarendon, reforming English law, with the aim of improving the justice process, including the jury system.^[2]
William Marshal, a Norman statesman, described as "the greatest knight that ever lived", is knighted while on campaign in Normandy.

Muirchertach mac Lochlainn, High King of Ireland, is killed. He is succeeded by Ruaidrí Ua Conchobair, king of Connacht, who defeats Diarmaid mac Murchadha (or Dermot) in battle, another ruler in eastern Ireland.

Births