Battle of the Frigidus

The Battle of the Frigidus, also called the Battle of the Frigid River, was fought between 5 and 6 September 394 between the army of the Roman emperor Theodosius the Great and the army of the rebel augustus Eugenius (r. 392–394), in the eastern border of Regio X in Roman Italia. Theodosius won the battle and defeated the usurpation of Eugenius and Arbogast, restoring unity to the Roman Empire. The battlefield, in the Claustra Alpium Iuliarum near the Julian Alps through which Theodosius's army had passed, was probably in the Vipava Valley – with the Frigidus River being the modern Vipava – or possibly in the valley of the Isonzo.

Battle of the Frigidus

The Battle of the Frigidus, also called the Battle of the Frigid River, was fought between 5 and 6 September 394 between the army of the Roman emperor Theodosius the Great and the army of the rebel augustus Eugenius (r. 392–394), in the eastern border of Regio X in Roman Italia. Theodosius won the battle and defeated the usurpation of Eugenius and Arbogast, restoring unity to the Roman Empire. The battlefield, in the Claustra Alpium Iuliarum near the Julian Alps through which Theodosius's army had passed, was probably in the Vipava Valley – with the Frigidus River being the modern Vipava – or possibly in the valley of the Isonzo.