Theodosius then moved from Constantinople with his army, and met Eugenius and Arbogast in the Battle of the Frigidus (Vipava Valley, Slovenia) on 6 September 394.
Historically, the upper eastern part of the valley, including the town of Vipava and half of the town of Ajdovščina, used to belong to the Duchy of Carniola (specifically, to Inner Carniola), while the lower western part was incorporated in the County of Gorizia and Gradisca and thus to the Austrian Littoral.
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