During the conflict between the two, a Roman force sent by Justinian seized control of a large portion of Hispania Baetica (Andalusia). The pretext for their arrival is unclear. Peter Heather states that Jordanes implies that Agila had summoned them.[3] Isidore of Seville offers two conflicting stories: in the section on Agila, the Goths surrounding him killed him out of fear "that Roman soldiers might invade Spain on the pretext of giving help"; while in the following section Isidore states Athanagild had asked Justinian for his help, but once they arrived in Spain "he was unable to remove them from the territory of the kingdom despite his efforts."[4] Collins notes that "in both of the emperor Justinian's other western interventions, Africa in 533 and Italy in 535, he came in ostensibly to uphold the rights of legitimate monarchs against usurpers", thus agreeing with Jordanes' version of the events.[2]
Although Athanagild recovered a few cities, the Romans held most of their conquest, which was organized as the province of Spania, long after the end of his reign. It is unclear the exact area this province covered. J. B. Bury states that it "comprised districts and towns to the west as well as to the east of the Straits of Gades" and included the cities of New Carthage (Cartagena), Corduba (Córdoba), and Assidonia.[5] Peter Heather, while agreeing it included New Carthage and Assionia, is dubious about Corduba, and is certain Málaga, and Sagontia were included.[6] Collins agrees that Corduba did not come under Roman control, nor did the Guadalquivir valley, stating that their principal strongholds were Medina Sidonia, Málaga and New Carthage.[7]
Athanagild died of natural causes in Toledo, according to Isidore, then, after an interregnum of five months, Liuva I became king.[8]