Battle of Dara [SEP] point in time
Battle of Dara
The Battle of Dara was fought between the Byzantine (Eastern Roman) Empire and the Sassanids in 530. It was one of the battles of the Iberian War.
Background.
The Byzantine Empire was at war with the Sassanids from 527, supposedly because Kavadh I had tried to force the Iberians to become Zoroastrians. The Iberian king fled from Kavadh, but Kavadh tried to make peace with the Byzantines, and attempted to have Justin I adopt his son Khosrau. Justin agreed, but on the terms
Anastasius builds the city of Dara, which would be a focus point for war during the reign of Justinian and site of the Battle of Dara. In this war, the Persians once again bring up the gates during negotiations, mentioning that they block the pass to the Huns for the benefit of both Persians and Byzantines and deserve to be compensated for their service. 
The Gates occur in later versions of the "Alexander Romance" of Pseudo-Callisthenes, in the interpolated chapter on the "Unclean Nations" (8th century