Battle of Callinicum: A Byzantine army under Belisarius is defeated by the Persians at Raqqa (northern Syria).

The Battle of Callinicum took place on Easter Saturday, 19 April 531 AD, between an army of the Byzantine Empire under Belisarius and a Sasanian cavalry force commanded by Azarethes. After being defeated at the Battle of Dara, the Sasanians moved to invade Roman Syria in an attempt to turn the tide of the war. Belisarius' rapid response foiled the plan, and his troops pushed the Persians to the Syrian border through maneuvering before forcing a battle in which the Sasanians won a Pyrrhic victory.