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This article is about the year 1055.
|Centuries:||10th century – 11th century – 12th century|
|Decades:||1020s 1030s 1040s – 1050s – 1060s 1070s 1080s|
|Years:||1052 1053 1054 – 1055 – 1056 1057 1058|
|1055 by topic|
|Lists of leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1808|
|English Regnal year||N/A|
|Chinese calendar||甲午年 (Wood Horse)
3751 or 3691
— to —
乙未年 (Wood Goat)
3752 or 3692
|- Vikram Samvat||1111–1112|
|- Shaka Samvat||977–978|
|- Kali Yuga||4156–4157|
|Japanese calendar||Tengi 3
|Minguo calendar||857 before ROC
|Seleucid era||1366/1367 AG|
|Thai solar calendar||1597–1598|
|Wikimedia Commons has media related to 1055.|
- January 11 – Theodora becomes reigning empress of the Byzantine Empire.
- October 24 – Ralph the Timid is defeated by the Welsh.
- Beginning of the campaign of Ferdinand I of Castile against al-Andalus. The king conquers Seia from the Christian allies of the muslim taifas. In a drive to consolidate his southern border, he repopulates the city of Zamora with some of his Cantabrian (montañeses) subjects.
- Construction on the Liaodi Pagoda in Hebei is complete, the tallest pagoda in Chinese history standing at a height of 84 m (275 ft) tall.
- April 13 – Pope Victor II succeeds Pope Leo IX as the 153rd pope.
- King Andrew I of Hungary establishes the Benedictine Tihany Abbey. Its foundation charter is the earliest written record extant in the Hungarian language.
- January 11 – Constantine IX Monomachos, emperor of the Eastern Roman Empire
- May 26 – Adalbert, Margrave of Austria
- Princess Godgifu, daughter of Æthelred the Unready