|Covid-19|The Almoravids conquer Aoudaghost (present-day Mauritania).
December 18 – The Seljuk Turks capture Baghdad; Al-Malik al-Rahim is taken prisoner.
January 11 – Theodora becomes reigning empress of the Byzantine Empire.
October 24 – Ralph the Timid is defeated by the Welsh.
Ferdinand I of Castile begins his campaign 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 completed (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.
Ida of Austria, Austrian duchess and crusader (d. 1101)
January 11 – Constantine IX Monomachos, emperor of the Eastern Roman Empire
May 26 – Adalbert, Margrave of Austria
Princess Godgifu, daughter of Æthelred the Unready
Year 1055 (MLV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.
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