891

• February 21 – Guy III, duke of Spoleto, is crowned Holy Roman Emperor by Pope Stephen V. His son Lambert is proclaimed king of Italy, at the capital of Pavia in Lombardy.Mann III, p. 377.
• Summer – Orso, Lombard prince of Benevento, is deposed after the capture of Benevento by the Byzantines. Benevento becomes the capital of the thema of Longobardia.{{sfn|Kreutz|1996|pp=63–66}}
• Battle of Leuven: Viking raiders on the Dyle River (near Leuven), in modern-day Belgium, suffer a crushing defeat by Frankish forces under King Arnulf of Carinthia.

• Muslim forces led by Abdullah ibn Muhammad al-Umawi, Umayyad emir of Córdoba, defeat the rebel leader Umar ibn Hafsun at Poley, in Al-Andalus (modern Spain).

• June 2 – Al-Muwaffaq, an Abbasid prince and Commander-in-chief, dies at the capital of Baghdad. His son Al-Mu'tadid is recognized as regent, and second heir of the Abbasid Caliphate.

• February 25 – Fujiwara no Mototsune, a Japanese statesman, dies. In his lifetime, he had forced the resignation of Emperor Yōzei and become head of the Fujiwara clan.

• September 14 – Pope Stephen V dies after a 6-year reign. He is succeeded by Formosus, former cardinal bishop of Portus, as the 111th pope of the Catholic Church.

• Abd al-Rahman III, Umayyad caliph (or 889)
• Ali ibn Buya, founder of the Buyid Dynasty (or 892)
• Gao Conghui, prince and ruler of Jingnan (d. 948)
• Lin Ding, Chinese official and chancellor (d. 944)
• Yuan Dezhao, Chinese chancellor (d. 968)

• February 25 – Fujiwara no Mototsune, Japanese regent (b. 836)
• June 2 – Al-Muwaffaq, Abbasid prince and regent (b. 842)
• June 25 – Sunderolt, archbishop of Mainz
• September 14 – Stephen V, pope of the Catholic Church
• October 23 – Yazaman al-Khadim, Abbasid emir
• Bernard, illegitimate son of Charles the Fat (or 892)
• Chen Yan, Chinese warlord and governor
• Enchin, Japanese Buddhist monk (b. 814)
• Gu Yanlang, Chinese warlord and governor
• Isma'il ibn Bulbul, Abbasid official and vizier
• Mutimir of Serbia, ruler of Principality of Serbia
• Wang Hui, chancellor of the Tang Dynasty

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• {{cite book |last=Kreutz |first=Barbara M. |year=1996|title=Before the Normans: Southern Italy in the Ninth and Tenth Centuries |location=Philadelphia |publisher=University of Pennsylvania Press |isbn=0-8122-1587-7 |url=https://books.google.com/books?id=P-ucSSZrJ0YC }}

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