1171

1171 (MCLXXI) was a common year starting on Friday of the Julian calendar, the 1171st year of the Common Era (CE) and Anno Domini (AD) designations, the 171st year of the 2nd millennium, the 71st year of the 12th century, and the 2nd year of the 1170s decade. As of the start of 1171, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium:	2nd millennium
Centuries:	11th century – 12th century – 13th century
Decades:	1140s  1150s  1160s  – 1170s –  1180s  1190s  1200s
Years:	1168 1169 1170 – 1171 – 1172 1173 1174

1171 in other calendars

Gregorian calendar	1171 MCLXXI
Ab urbe condita	1924
Armenian calendar	620 ԹՎ ՈԻ
Assyrian calendar	5921
Balinese saka calendar	1092–1093
Bengali calendar	578
Berber calendar	2121
English Regnal year	17 Hen. 2 – 18 Hen. 2
Buddhist calendar	1715
Burmese calendar	533
Byzantine calendar	6679–6680
Chinese calendar	庚寅年 (Metal Tiger) 3867 or 3807     — to — 辛卯年 (Metal Rabbit) 3868 or 3808
Coptic calendar	887–888
Discordian calendar	2337
Ethiopian calendar	1163–1164
Hebrew calendar	4931–4932
Hindu calendars
- Vikram Samvat	1227–1228
- Shaka Samvat	1092–1093
- Kali Yuga	4271–4272
Holocene calendar	11171
Igbo calendar	171–172
Iranian calendar	549–550
Islamic calendar	566–567
Japanese calendar	Kaō 3 / Jōan 1 (承安元年)
Javanese calendar	1078–1079
Julian calendar	1171 MCLXXI
Korean calendar	3504
Minguo calendar	741 before ROC 民前741年
Nanakshahi calendar	−297
Seleucid era	1482/1483 AG
Thai solar calendar	1713–1714
Tibetan calendar	阳金虎年 (male Iron-Tiger) 1297 or 916 or 144     — to — 阴金兔年 (female Iron-Rabbit) 1298 or 917 or 145

Events

• Saladin bans the Fatimid Caliphate, bringing back Sunni rule in Egypt.
• Manuel I Comnenus orders all the Venetians in the Byzantine Empire to be arrested.
• Rhys ap Gruffydd agrees to talk to Henry II of England.
• Building of the Cathedral of Saint Sabino in Bari is finished.
• Serbian ruler Stefan Nemanja begins to rule alone.
• Alfonso II of Aragon beats Caspe and Teruel.
• Henry II of England starts eight centuries of conflict and war between Ireland and England.
• Pisa and Florence make an alliance against Lucca and Genoa.
• The Heirs of Robert Burdet leave Catalonia.

Births

• August 15 — King Alfonso IX of León (d. 1230)
• Agnes of France, daughter of Louis VII of France (d. after 1207)

Deaths

• January 1 — Diarmait Mac Murchada, King of Leinster (b. 1110)
• February 20 — Conan IV, Duke of Brittany (b. 1138)
• November 8 — Baldwin IV, Count of Hainaut (b. 1108)
• Henry of Blois, bishop of Winchester (b. 1111)
• Gleb of Kiev