The Moravian War was a conflict beginning in 853 that lasted until 856 between the Carolingian Union and the rebellious Moravians. Interrupting the First Viking War, the Moravian War was put down fairly quickly to allow the Franks and Byzantines to return to the pressing Viking War, which was entering its second decade by the conclusion of the Moravian War. The war resulted in a Frankish victory and the death of Mojmir of Moravia.