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Millennium: 2nd millennium
1171 in various calendars
Gregorian calendar1171
Ab urbe condita1924
Armenian calendar620
Assyrian calendar5921
Balinese saka calendar1092–1093
Bengali calendar578
Berber calendar2121
English Regnal year17 Hen. 2 – 18 Hen. 2
Buddhist calendar1715
Burmese calendar533
Byzantine calendar6679–6680
Chinese calendar庚寅年 (Metal Tiger)
3867 or 3807
    — to —
辛卯年 (Metal Rabbit)
3868 or 3808
Coptic calendar887–888
Discordian calendar2337
Ethiopian calendar1163–1164
Hebrew calendar4931–4932
Hindu calendars
 - Vikram Samvat1227–1228
 - Shaka Samvat1092–1093
 - Kali Yuga4271–4272
Holocene calendar11171
Igbo calendar171–172
Iranian calendar549–550
Islamic calendar566–567
Japanese calendarKaō 3 / Jōan 1
Javanese calendar1078–1079
Julian calendar1171
Korean calendar3504
Minguo calendar741 before ROC
Nanakshahi calendar−297
Seleucid era1482/1483 AG
Thai solar calendar1713–1714
Tibetan calendar阳金虎年
(male Iron-Tiger)
1297 or 916 or 144
    — to —
(female Iron-Rabbit)
1298 or 917 or 145
King Henry II arrives at Waterford.

Year 1171 (MCLXXI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.


By place[edit]

Byzantine Empire[edit]

  • March 12 – Emperor Manuel I (Komnenos) orders the arrest of all Venetians in his empire, and seizes their ships and goods. In September, Doge Vitale II Michiel leads a Venetian fleet (120 ships) against the Byzantines, conquering the cities of Trogir and Dubrovnik. But the plague takes a heavy toll among the fleet's crewmen; half the ships have to be burned to keep them from falling into enemy hands. A plague also breaks out in Venice, when the remaining ships return.



  • July – King Henry II decides to lead a military expedition to Ireland and summons Richard de Clare (Strongbow) to join forces. In September, Richard travels to England and promises his loyalty to Henry. He is granted Leinster as a fiefdom and is honored with the post of "royal constable in Ireland". The army is assembled at Pembroke – several siege towers are shipped over, should Henry need to assault the Norman-held towns (or others such as Cork and Limerick).[2]
  • October 17 – Henry II invades Ireland and lands with a large army of at least 500 mounted knights, and 4,000 men and archers at Waterford. Henry commandeers merchant ships as part of his invasion.[3] He claims the ports of Dublin, Waterford, and Wexford, and promises the Irish chieftains protection if they will acknowledge him as their overlord. Henry is recognized as "Lord of Ireland", traders are invited to Dublin where an English colony is set up.[3]
  • Ascall mac Ragnaill (or Torcaill), last Norse–Gaelic king of Dublin, is captured while trying to retake Dublin from the English forces under Richard de Clare, perhaps in company with Sweyn Asleifsson, and is beheaded. Before the end of the year, Richard relinquishes possession of the city to Henry II, who converts it into an English royal town.




  • Yesugei (Baghatur), Mongol chieftain, arranges a marriage between his 9-year-old son Temujin (Genghis Khan) and the daughter of the chief of a nearby clan, Börte. He is poisoned by the Tatars while sharing a meal during the wedding.[5]




  1. ^ McGrank, Lawrence (1981). "Norman crusaders and the Catalan reconquest: Robert Burdet and the principality of Tarragona 1129-55". journal of Medieval History. 7 (1): 67–82. doi:10.1016/0304-4181(81)90036-1.
  2. ^ Martin, Francis Xavier (2008). "Chapter 2: Diarmaid mac Murchadha and the coming of the Anglo-Normans". In Art Cosgrove (ed.). A New History of Ireland, Volume II: Medieval Ireland 1169–1534. Oxford University Press. p. 87.
  3. ^ a b Warren, W. L. (1961). King John. University of California Press. pp. 34, 121.
  4. ^ Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, pp. 318–319. ISBN 978-0-241-29876-3.
  5. ^ Cleaves, Francis Woodman (1982). The Secret History of the Mongols, p. 17. Harvard-Yenching Institute. ISBN 978-0-674-79670-6.
  6. ^ Wiet, G. (1960). "al-ʿĀḍid li-Dīn Allāh". In Gibb, H. A. R.; Kramers, J. H.; Lévi-Provençal, E.; Schacht, J.; Lewis, B. & Pellat, Ch. (eds.). The Encyclopaedia of Islam, Second Edition. Volume I: A–B. Leiden: E. J. Brill. pp. 196–197. OCLC 495469456.