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1027 in various calendars
Gregorian calendar	1027; MXXVII
Ab urbe condita	1780
Armenian calendar	476; ԹՎ ՆՀԶ
Assyrian calendar	5777
Balinese saka calendar	948–949
Bengali calendar	434
Berber calendar	1977
English Regnal year	N/A
Buddhist calendar	1571
Burmese calendar	389
Byzantine calendar	6535–6536
Chinese calendar	丙寅年 (Fire Tiger); 3724 or 3517; — to —; 丁卯年 (Fire Rabbit); 3725 or 3518
Coptic calendar	743–744
Discordian calendar	2193
Ethiopian calendar	1019–1020
Hebrew calendar	4787–4788
Hindu calendars
- Vikram Samvat	1083–1084
- Shaka Samvat	948–949
- Kali Yuga	4127–4128
Holocene calendar	11027
Igbo calendar	27–28
Iranian calendar	405–406
Islamic calendar	417–418
Japanese calendar	Manju 4; (万寿４年)
Javanese calendar	929–930
Julian calendar	1027; MXXVII
Korean calendar	3360
Minguo calendar	885 before ROC; 民前885年
Nanakshahi calendar	−441
Seleucid era	1338/1339 AG
Thai solar calendar	1569–1570
Tibetan calendar	阳火虎年; (male Fire-Tiger); 1153 or 772 or 0; — to —; 阴火兔年; (female Fire-Rabbit); 1154 or 773 or 1

Millennium:	2nd millennium
Centuries:	10th century; 11th century ; 12th century;
Decades:	1000s; 1010s; 1020s ; 1030s; 1040s;
Years:	1024; 1025; 1026; 1027 ; 1028; 1029; 1030;

Events

March 26 – Pope John XIX crowns Conrad II ("the Elder") and his wife Gisela of Swabia as Holy Roman Emperor and Empress, respectively, in Old St. Peter's Basilica in Rome.^[1] Cnut the Great, King of Denmark and England, attends the coronation, proving his position as sole ruler of the Danish North Sea Empire.
May 14 – King Robert II of France ("the Pious") sues for peace with his sons. Henry I is crowned co-king of France at Reims Cathedral, but has little power to rule (until 1031).^[2]
August 6 – Robert the Magnificent becomes duke of Normandy after the death of his brother Richard III.
Duke Sergius IV of Naples donates the County of Aversa to a band of Norman mercenaries led by Rainulf Drengot, who support him in the war with Capua.
King Sigtrygg Silkbeard of Dublin and sub-King Flannacán of Brega make a pilgrimage to Rome.
Ealdred is appointed abbot of Tavistock Abbey in England (approximate date).

August 16 – Bagrat IV becomes king of Georgia on the death of his father, George I. Queen Dowager Mariam becomes regent for her 9-year-old son.
Wedding of Crown Prince Atsunaga of Japan and Imperial Princess Teishi.
This is the first year of the first rabjyung (60-year) cycle to start in the Tibetan calendar.

The Book of Healing (Arabic: کتاب الشفاء Kitab Al-Shifaʾ, Latin: Sufficientia), a comprehensive scientific and philosophical encyclopedia written by the Persian polymath Avicenna (Abū ʿAlī ibn Sīnā), is published.^[3]
Song dynasty Chinese engineer Yan Su reinvents the 3rd-century south-pointing chariot, a mechanical-driven compass vehicle (as recorded in the Song Shi).

^ Wolfram, Herwig (2006). Conrad II, 990-1039: Emperor of Three Kingdoms. Pennsylvania State University Press. p. 102. ISBN 0-271-02738-X.
^ Clark, William W. (2006). Medieval Cathedrals. Westport, CT: Greenwood Publishing. p. 87. ISBN 978-0-313-32693-6.
^ Goodman, Lenn Evan (1992). Avicenna. London: Routledge. p. 31. ISBN 0-415-01929-X.
^ Izumi Shikibu writes a poem to her memory.
^ Noble, Samuel (December 17, 2010). "Sulayman al-Ghazzi". In Thomas, David; Mallett, Alexander (eds.). Christian-Muslim Relations. A Bibliographical History. Volume 2 (900-1050). BRILL. p. 617. ISBN 978-90-04-21618-1. Retrieved January 16, 2024.