Battle of Mardia
Encyclopedia
The Battle of Mardia, also known as Battle of Campus Mardiensis or Battle of Campus Ardiensis, was fought, probably at modern Harmanli
Harmanli
Harmanli is a town in Haskovo Province, South-central Bulgaria. It is the administrative centre of the homonymous Harmanli Municipality. As of December 2009, the town has a population of 18,557 inhabitants....

 (Bulgaria
Bulgaria
Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

) in Thrace
Thrace
Thrace is a historical and geographic area in southeast Europe. As a geographical concept, Thrace designates a region bounded by the Balkan Mountains on the north, Rhodope Mountains and the Aegean Sea on the south, and by the Black Sea and the Sea of Marmara on the east...

, in late 316
316
Year 316 was a leap year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Sabinus and Rufinus...

/early 317
317
Year 317 was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Gallicanus and Bassus...

 between the forces of Roman Emperor
Roman Emperor
The Roman emperor was the ruler of the Roman State during the imperial period . The Romans had no single term for the office although at any given time, a given title was associated with the emperor...

s Constantine I
Constantine I
Constantine the Great , also known as Constantine I or Saint Constantine, was Roman Emperor from 306 to 337. Well known for being the first Roman emperor to convert to Christianity, Constantine and co-Emperor Licinius issued the Edict of Milan in 313, which proclaimed religious tolerance of all...

 and Licinius
Licinius
Licinius I , was Roman Emperor from 308 to 324. Co-author of the Edict of Milan that granted official toleration to Christians in the Roman Empire, for the majority of his reign he was the rival of Constantine I...

.

Background

Open civil war between Constantine and Licinius broke in 316 when the former invaded Licinius' Balkan provinces. After his crushing defeat at the Battle of Cibalae
Battle of Cibalae
The Battle of Cibalae was fought on October 8, 314 , between the two Roman emperors Constantine I and Licinius. The site of the battle was approximately 350 kilometers within the territory of Licinius...

 on October 8, 316, (some historians date it in 314), Licinius fled to Sirmium
Sirmium
Sirmium was a city in ancient Roman Pannonia. Firstly mentioned in the 4th century BC and originally inhabited by the Illyrians and Celts, it was conquered by the Romans in the 1st century BC and subsequently became the capital of the Roman province of Lower Pannonia. In 294 AD, Sirmium was...

 then further south to Adrianople where he collected a second army, under the command of an officer named Valerius Valens
Valerius Valens
Aurelius Valerius Valens was Roman Emperor from late 316 to March 1, 317. Valens had previously been dux limitis in Dacia, but this is all we know of him....

 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.

The battle

In the meantime, Constantine had moved through the Balkan mountains and established his base at Philippi
Philippi
Philippi was a city in eastern Macedonia, established by Philip II in 356 BC and abandoned in the 14th century after the Ottoman conquest...

 or Philippopolis
Plovdiv
Plovdiv is the second-largest city in Bulgaria after Sofia with a population of 338,153 inhabitants according to Census 2011. Plovdiv's history spans some 6,000 years, with traces of a Neolithic settlement dating to roughly 4000 BC; it is one of the oldest cities in Europe...

. Then he led the bulk of his army against Licinius. In the ensuing fierce battle, both sides inflicted heavy injuries on each other until darkness interrupted the indecisive struggle. During the night, Licinius managed to keep his army from disintegration and retreated north-west towards Beroe/Augusta Traiana
Stara Zagora
Stara Zagora is the sixth largest city in Bulgaria, and a nationally important economic center. Located in Southern Bulgaria, it is the administrative capital of the homonymous Stara Zagora Province...

. Thus, Constantine was again victorious but not decisively

Another possible location for the battle place is a few km west-southwest of Adrianople (modern Edirne
Edirne
Edirne is a city in Eastern Thrace, the northwestern part of Turkey, close to the borders with Greece and Bulgaria. Edirne served as the capital city of the Ottoman Empire from 1365 to 1453, before Constantinople became the empire's new capital. At present, Edirne is the capital of the Edirne...

), at the basin of Ardas River (ancient Harpessos), a tributary of Maritsa
Maritsa
The Maritsa or Evros , ) is, with a length of 480 km, the longest river that runs solely in the interior of the Balkans. It has its origin in the Rila Mountains in Western Bulgaria, flowing southeast between the Balkan and Rhodope Mountains, past Plovdiv and Parvomay to Edirne, Turkey...

 River.

Aftermath

Constantine, thinking that Licinius was fleeing to Byzantium
Byzantium
Byzantium was an ancient Greek city, founded by Greek colonists from Megara in 667 BC and named after their king Byzas . The name Byzantium is a Latinization of the original name Byzantion...

 in order to retreat to his Asian base, headed to that direction, unintentionally placing Licinius between himself and his communication lines with the West. It seemed that his aggressiveness had turned against him this time. However, both belligerents had reasons to come to terms since Licinius was still in precarious position, so he sent a certain Mestrianus to negotiate with Constantine. Even then, Constantine delayed the discussions until he was made sure that the outcome of the war was indeed uncertain. A critical point might be when he received news of a sudden enemy raid that captured his baggage and the royal entourage.

According to the peace finalized at Serdica on 1 March 317 (a date chosen deliberately by Constantine because it was the anniversary of his father's elevation), Licinius recognised Constantine as his superior in government, ceded to him all European territories except for Thrace
Thrace
Thrace is a historical and geographic area in southeast Europe. As a geographical concept, Thrace designates a region bounded by the Balkan Mountains on the north, Rhodope Mountains and the Aegean Sea on the south, and by the Black Sea and the Sea of Marmara on the east...

 and deposed and executed Valens. Constantine named himself and Licinius consul
Consul
Consul was the highest elected office of the Roman Republic and an appointive office under the Empire. The title was also used in other city states and also revived in modern states, notably in the First French Republic...

s while his two sons Crispus
Crispus
Flavius Julius Crispus , also known as Flavius Claudius Crispus and Flavius Valerius Crispus, was a Caesar of the Roman Empire. He was the first-born son of Constantine I and Minervina.-Birth:...

 and Constantine II (emperor)
Constantine II (emperor)
Constantine II , was Roman Emperor from 337 to 340. Co-emperor alongside his brothers, his short reign saw the beginnings of conflict emerge between the sons of Constantine the Great, and his attempt to exert his perceived rights of primogeniture ended up causing his death in a failed invasion of...

as well as Licinius' son were appointed Caesars. The peace lasted for about seven years.
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