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844 ( ) was a DCCCXLIV leap year starting on Tuesday (link will display the full calendar) of the Julian calendar.
Viking raiders ascend the River Garonne as far as the city of Toulouse, and pillage the lands of Septimania. Part of the marauding Vikings invades Galicia (Northern Spain), where some perish in a storm at sea. After being defeated in Corunna, the Scandinavian raiders sack the Umayyad cities of Seville ( see below), Niebla, Beja, and Lisbon.  Summer – King
Charles the Bald struggles against the repeated rebellions in Aquitaine, and against the Bretons in West Francia. He besieges Bernard I at the Battle of Toulouse, while Duke Nominoe raids into Maine, and plunders other Frankish territory. 
June 15 – Louis II, eldest son of Emperor Lothair I, is crowned king at Rome by Pope Sergius II, and becomes co-ruler of Middle Francia, and over Lombardy, Friuli, and Tuscany in Italy. September 25–November 11 or 17 – Viking raid on Seville (844): Vikings arrive in Seville by the Guadalquivir, taking the city on October 1 or 3 and pillaging it; but are expelled by forces of the Emirate of Córdoba.
January 11 – Michael I, Byzantine emperor
January 25 – Gregory IV, pope of the Catholic Church
Abdallah ibn Tahir, Muslim governor (or 845)
Abu Ja'far Ashinas, Muslim general
Alberik II, Frankish bishop
Bera, count of Barcelona
Bernard II, count of Poitiers
Bernard I, duke of Septimania
Chen Yixing, chancellor of the Tang Dynasty
Ekkehard, Frankish nobleman
Galindo Garcés, count of Aragon
Hugh, illegitimate son of Charlemagne (b. 802)
Merfyn Frych, king of Gwynedd ( Wales)
Mukhariq, Abbasid court singer
Nithard, Frankish historian
Rædwulf, king of Northumbria (approximate date)
Tachibana no Hayanari, Japanese calligrapher (d. 782) Theodrada, Frankrish princess and abbess (or 853)
Vasiliev 1935, pp. 399–404.
Rucquoi, Adeline (1993). Histoire médiévale de la Péninsule ibérique. Paris: Seuil. p. 85. ISBN 2-02-012935-3.
AF a. 844: Karolus Aquitaniam, quasi ad partem regni sui iure pertinentem, affectans ... ("Charles wanted Aquitaine, which belonged by right to a part of his kingdom").