The Battle of Mardia, also known as Battle of Campus Mardiensis or Battle of Campus Ardiensis, was probably fought at modern Harmanli in Thrace, in late 316/early 317 between the forces of Roman Emperors Constantine I and Licinius.Open civil war between Constantine and Licinius broke out in 316 when the former invaded Licinius' Balkan provinces. After his crushing defeat at the Battle of Cibalae on October 8, 316, , Licinius fled to Sirmium then further south to Adrianople. There he collected a second army, under the command of an officer named Valerius Valens whom he raised to the rank of Augustus. Simultaneously, he tried to negotiate with Constantine but the latter, insulted by the elevation of Valens and confident from his recent victory, rejected the peace offer.
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