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Events

Danish Vikings land in the Breton March (western part of Gaul). Duke Nominoe of Brittany fails to withstand them in battle, but succeeds in buying them off with gifts and persuading them to leave (approximate date).
Viking Age: The Vikings plunder the Lower Rhine, as part of their attacks on the Empire of Francia.
The Saracens, under the Berber leader Kalfun, capture the Byzantine city of Bari (Southern Italy). He becomes the first ruler of the Emirate of Bari, and expands his influence on the Italian mainland with raids.^[1]

August 10 – Abbasid Caliph Al-Wathiq dies of dropsy after a five-year reign. He is succeeded by his brother al-Mutawakkil.^[2]

January 24 – Pope Sergius II dies of gout after a 3-year reign.
April 10 – Leo IV is consecrated 103rd pope of Rome (where he was born c.790). Because of the sense of urgency driven by the previous year’s Arab raid against Rome, he is consecrated without waiting for the consent of the Holy Roman Emperor. He will reign until 855.^[3]
April 21 – Rabanus Maurus, a Frankish Benedictine monk, becomes archbishop of Mainz after the death of Odgar.

^ Kreutz, Barbara M. (1996). Before the Normans: Southern Italy in the Ninth and Tenth Centuries. Philadelphia: University of Pennsylvania Press. p. 38. ISBN 0-8122-1587-7.
^ Kennedy, Hugh (2006). When Baghdad Ruled the Muslim World: The Rise and Fall of Islam’s Greatest Dynasty. Cambridge, MA: Da Capo Press. p. 232. ISBN 978-0-306814808.
^ One or more of the preceding sentences incorporates text from a publication now in the public domain: Mann, Horace (1910). “Pope St. Leo IV“. In Herbermann, Charles (ed.). Catholic Encyclopedia. Vol. 9. New York: Robert Appleton Company.

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