The Battle of Argentovaria was fought in May 378

378

Year 378 was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valens and Augustus...

 between the Roman Empire

Roman Empire

The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

 and the invading army of the Lentienses

Lentienses

The Lentienses were an Germanic tribe in the region between the river Danube in the North, the river Iller in the East, and Lake Constance in the South, in what is now south Germany. They were reported to be one of the most rebellious tribes at the time...

, a branch of the Alamanni

Alamanni

The Alamanni, Allemanni, or Alemanni were originally an alliance of Germanic tribes located around the upper Rhine river . One of the earliest references to them is the cognomen Alamannicus assumed by Roman Emperor Caracalla, who ruled the Roman Empire from 211 to 217 and claimed thereby to be...

, at Argentovaria (near Colmar

Colmar

Colmar is a commune in the Haut-Rhin department in Alsace in north-eastern France.It is the capital of the department. Colmar is also the seat of the highest jurisdiction in Alsace, the appellate court....

, France). With this defeat, the Lentienses disappear from history.

The king of Lentienses, Priarius, died during the battle. Emperor Gratian

Gratian

Gratian was Roman Emperor from 375 to 383.The eldest son of Valentinian I, during his youth Gratian accompanied his father on several campaigns along the Rhine and Danube frontiers. Upon the death of Valentinian in 375, Gratian's brother Valentinian II was declared emperor by his father's soldiers...

, who had given the command of the army for the battle to Naniemus and Mallobaudes

Mallobaudes

Mallobaudes or Mellobaudes was a 4th-century Frankish king who also held the Roman title of comes domesticorum.In 354 he was a tribunus armaturarum in the Roman army in Gaul, where he served under Silvanus, who usurped power in 355. Malobaudes tried unsuccessfully to intervene on his behalf...

, gained the title of Alemannicus Maximus.