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1089 in various calendars
Gregorian calendar	1089; MLXXXIX
Ab urbe condita	1842
Armenian calendar	538; ԹՎ ՇԼԸ
Assyrian calendar	5839
Balinese saka calendar	1010–1011
Bengali calendar	496
Berber calendar	2039
English Regnal year	2 Will. 2 – 3 Will. 2
Buddhist calendar	1633
Burmese calendar	451
Byzantine calendar	6597–6598
Chinese calendar	戊辰年 (Earth Dragon); 3786 or 3579; — to —; 己巳年 (Earth Snake); 3787 or 3580
Coptic calendar	805–806
Discordian calendar	2255
Ethiopian calendar	1081–1082
Hebrew calendar	4849–4850
Hindu calendars
- Vikram Samvat	1145–1146
- Shaka Samvat	1010–1011
- Kali Yuga	4189–4190
Holocene calendar	11089
Igbo calendar	89–90
Iranian calendar	467–468
Islamic calendar	481–482
Japanese calendar	Kanji 3; (寛治３年)
Javanese calendar	993–994
Julian calendar	1089; MLXXXIX
Korean calendar	3422
Minguo calendar	823 before ROC; 民前823年
Nanakshahi calendar	−379
Seleucid era	1400/1401 AG
Thai solar calendar	1631–1632
Tibetan calendar	阳土龙年; (male Earth-Dragon); 1215 or 834 or 62; — to —; 阴土蛇年; (female Earth-Snake); 1216 or 835 or 63

Millennium:	2nd millennium
Centuries:	10th century; 11th century ; 12th century;
Decades:	1060s; 1070s; 1080s ; 1090s; 1100s;
Years:	1086; 1087; 1088; 1089 ; 1090; 1091; 1092;

Year 1089 (MLXXXIX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.

Events

April 20 (possible date) – Demetrius Zvonimir, king of Croatia, dies after a 12-year reign, and is succeeded by Stephen II. Zvonimir's widow, Helena of Hungary, Queen of Croatia, plots the inheritance of the Croatian crown for her brother, King Ladislaus I of Hungary.
June 24 – Reconquista: Gaston IV, Viscount of Béarn (supported by French crusaders) reconquers the Aragonese city of Monzón from Emir Al-Mustain II of the Taifa of Zaragoza.^[1]
August 18 – Henry IV, Holy Roman Emperor, marries Eupraxia of Kiev (daughter of Grand Prince Vsevolod I) at Cologne. She is crowned and assumes the name Adelaide (or Adelheid).
King George II abdicates the throne in favour of his 16-year-old son David IV ("the Builder") who becomes ruler of Georgia (until 1125).

March 21 – Cîteaux Abbey, the first Cistercian monastery, is established by a group of French monks under Robert of Molesme in southern France.
August 28 – Braga Cathedral in the County of Portugal has its reconstruction (following 353 years of Muslim occupation) completed sufficiently for its consecration to the Virgin Mary to take place.
September
- The Synod of Melfi, led by Pope Urban II (his first papal council), issues decrees against simony and clerical marriage.^[2]
- A church council, held in Constantinople, discuses relations between Eastern and Western Christianity.^[3]

^ Canellas, Angel (1951). "Las Cruzadas de Aragon en el Siglo XI". Argensola: Revista de Ciencias Sociales del Instituto de Estudios Altoaragoneses. 7. ISSN 0518-4088. Archived from the original on July 14, 2014. Retrieved February 22, 2012.
^ "Pope Bl. Urban II". Catholic Encyclopedia. Retrieved September 1, 2024 – via New Advent.
^ Siecienski, Anthony Edward (2010). The Filioque: History of a Doctrinal Controversy. Oxford University Press. p. 117. ISBN 978-0-19-537204-5.