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Year 889 (DCCCLXXXIX) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.
- Guy III, duke of Spoleto, defeats the Lombard king Berengar I at the Trebbia River, and is acclaimed as king of Italy at an assembly in Pavia. After confirming some privileges to the Catholic Church, he is crowned with the Iron Crown of Lombardy, by Pope Stephen V. Berengar is forced to retreat to Verona; Guy does not pursue him into Friuli, because of the (possible) wrath of King Arnulf of Carinthia.
- Boris I, ruler (khan) of the Bulgarian Empire, abdicates the throne after a 37-year reign, and retires to a monastery. He is succeeded by his eldest son Vladimir, as monarch of Bulgaria. Vladimir falls under the influence of the old boyars; many remain anti-Christian and anti-Byzantine. He attempts to restore the former Frankish alliance, and to reestablish paganism.
- Arnulf of Carinthia has his illegitimate son Zwentibold recognized, as heir of the East Frankish Kingdom. He supports the claim of Louis the Blind as king of Provence, after receiving a personal appeal from Louis's mother, Ermengard, who comes to see Arnulf at Forchheim (Northern Bavaria). Arnulf grants the town of Osnabrück trade and coinage privileges.
- A ship carrying about twenty Arab freebooters, from Pechina in Al-Andalus (modern Spain), sets anchor in the Gulf of Saint-Tropez in Provence. They establish a fortified base at Fraxinet (modern-day La Garde-Freinet). After raiding the surrounding area, the Muslim colony is bolstered by contingents of Saracen adventurers.
- The Magyars, an Ugric tribe from the steppe of Central Asia, move west under the leadership of Árpád. They are pushed by their rivals, the Pechenegs, into the Balkan Peninsula, and become entangled in a war between Bulgaria and the Byzantine Empire. The Magyars head north and settle in Great Moravia.
- In Italy, Forlì becomes a republic for the first time. The city is allied with the Ghibelline faction, in the medieval struggles between the Guelphs and Ghibellines.
- In Portugal, the count of Coimbra, Hermenegildo Gutiérrez, reconquers Coimbra, which was temporarily lost after the first conquest of 878.
- June 9 – Aimoin, Frankish monk and archivist
- December 23 – Solomon II, bishop of Constance
- Bořivoj I, duke of Bohemia (approximate date)
- Ibn Marwan, Muslim Sufi leader (approximate date)
- Ibn Qutaybah, Muslim scholar (b. 828)
- Indravarman I, king of the Khmer Empire (or 890)
- Judicael, duke of Brittany (or 888)
- Liutbert, archbishop of Mainz
- Meng Fangli, Chinese warlord
- Qin Zongquan, Chinese warlord
- Sa'id ibn Makhlad, Muslim vizier
- Wang Jingwu, Chinese warlord
- Wilbert, archbishop of Cologne
- Zhao Chou, Chinese warlord (b. 824)
- Zhao Huang, Chinese warlord
- ^ Canduci, p. 221.
- ^ John V.A. Fine, Jr. (1991). The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, p. 130. ISBN 978-0-472-08149-3.
- ^ Mann III, p. 382.
- ^ Picard, Christophe (2000). Le Portugal musulman (VIIIe-XIIIe siècle0. L'Occident d'al-Andalus sous domination islamique. Paris: Maisonneuve & Larose. p. 109. ISBN 2-7068-1398-9.