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This article is about the year 858. For the number, see 858 (number). For the terrorist attack on Korean air, see Korean Air Flight 858.
|Centuries:||8th century – 9th century – 10th century|
|Decades:||820s 830s 840s – 850s – 860s 870s 880s|
|Years:||855 856 857 – 858 – 859 860 861|
|858 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1611|
|Chinese calendar||丁丑年 (Fire Ox)
3554 or 3494
— to —
戊寅年 (Earth Tiger)
3555 or 3495
|- Vikram Samvat||914–915|
|- Shaka Samvat||779–780|
|- Kali Yuga||3958–3959|
|Japanese calendar||Ten'an 2
|Minguo calendar||1054 before ROC
|Seleucid era||1169/1170 AG|
|Thai solar calendar||1400–1401|
- Summer – King Louis the German, summoned by the diseffected Frankish nobles, invades the West Frankish Kingdom and secures Aquitaine for his nephew Pepin II ("the Younger"). King Charles the Bald flees to Burgundy, he is saved by the help of the bishops and by the fidelity of the family of the Welfs, who are related to Judith (second wife of former emperor Louis the Pious).
- Viking raiders led by Björn Ironside set fire to the earliest church on the site of Chartres Cathedral. Charles the Bald pays him tribute (Danegeld) to save Verberie (Northern France).
- January 13 – King Æthelwulf of Wessex dies after an 18-year reign and is succeeded by his eldest son Æthelbald. He marries his father's young widow Judith (daughter of Charles the Bald) and becomes sole ruler of Wessex. His brother, Æthelberht is left in charge to rule Kent and the south-east of England.
- February 13 – King Kenneth I (Cináed mac Ailpín), king of the Scots, dies after a 15-year reign in which he has been crowned at Scone and united the various parts of Scotland with his native Dál Riata. His 46-year-old brother succeeds as Donald I, king of Alba.
- October 7 – Emperor Montoku dies after a 8-year reign. He is succeeded by his 8-year-old son Seiwa as the 56th emperor of Japan, with Fujiwara no Yoshifusa (Seiwa's grandfather) governing as regent and great minister of the Council of State.
- An enormous flood along the Grand Canal inundates thousands of acres of farmland and kills tens of thousands of people in the North China Plain.
- April 17 – Pope Benedict III dies after a 3-year reign in which he has intervened in a political conflict between the sons of emperor Lothair I. He is succeeded by Nicholas I as the 105th pope of Rome.
- Synod of Quierzy: The bishops remain loyal to Charles the Bald during the invasion of his dominions by Louis the German. They address a conciliatory letter to Louis the German, which includes the False Decretals.
- October 23 – Ignatios I, patriarch of Constantinople, is imprisoned by orders of emperor Michael III and replaced by the layman Photius I.
- Al-Battani, Muslim astronomer and mathematician (d. 929)
- Cele Dabhaill mac Scannal, Irish abbot (d. 927)
- Gao Jixing, founder of Chinese Jingnan (d. 929)
- He Gui, general of Later Liang (d. 919)
- Lady Wu, wife of Qian Liu (d. 919)
- Liu Xun, general of Later Liang (d. 921)
- Mansur al-Hallaj, Persian mystic writer (d. 922)
- Niftawayh, Muslim scholar and grammarian (d. 935)
- Richard, duke of Burgundy (approximate date)
- Rudaki, Persian poet (approximate date)
- Tian Jun, Chinese warlord (d. 903)
- Zhang Juhan, official of Later Liang (d. 928)
- January 13 – Æthelwulf, king of Wessex
- February 13 – Kenneth I, king of Scotland (b. 810)
- April 17 – Benedict III, pope of the Catholic Church
- October 7 – Montoku, emperor of Japan (b. 826)
- Leuthard II, Frankish count (or 869)
- Li Shangyin, Chinese official and poet
- Liu Zhuan, chancellor of the Tang Dynasty (b. 796)
- Theodosius, patriarch of the Church of the East
- Wei Mo, chancellor of the Tang Dynasty (b. 793)