Hurdes, Batuecas, and the territory of the Riccones. Whilst preparing to check the imminent advance of the Suebi in 573, Liuvigild received news that his brother Liuva had died, which left him ruler over the entirety of the Visigothic dominions. Liuvigild made efforts to secure a peaceful succession, a perennial Visigothic issue, by associating his two sons, Hermenegild and Reccared, with himself in the kingly office and placing certain regions under their regencies; namely, making them dukes over Toledo and Narbonne. The Visigoths were still a military aristocracy and kings had to be formally ratified by the nobility. Visigoths and their Ibero-Roman subjects were still separated by religion and by distinct law codes. Liuvigild modified the old Code of Euric which governed the Goths and created his own Codex Revisus. He also repealed old Roman laws dating back to the late 4th century forbidding intermarriage between Visigoths and Ibero-Romans. Such marriages had once been considered a crime punishable by death. Through this action and others administrative moves, Liuvigild reassured his rule and when he had secured the capital, began a new campaign, during which he conquered the district of Sabaria, the province of Braganza, and Torre de Moncorvo along the Suebian frontier. Gregory of Tours contended that Liuvigild exceeded his power when he divided the kingdom between his two sons, but it is feasible that he took this action to weaken the authority of the nobles from amid both the Visigoths and the Spanish-Romans. Whatever Liuvigild's original motivation was or whether this move to empower his children can be viewed as beyond his authority, the act stirred several insurrections— first among the Cantabri, then amid the people of Cordova and Asturia, and lastly in Toledo and Evora—at a time when the Suebi and Byzantines were planning attacks against Liuvigild. Undeterred by these manifold threats, he attended to the concerns within his empire and with his son Reccared's assistance, he succeeded in subduing the rebels who rose to oppose him. In doing so, he seized Ammaia, the capital of the Cantabri; he took the Asturian stronghold, Saldania (Saldana); he also successfully quelled insurgent activities in Toledo and Evora (Aebura Carpetana). Not given to mercy—in every rebellious region—he sealed his victories by exacting terrible punishments upon his erstwhile enemies. Sometime during this campaign in 576, Liuvigild's predominance led to the Suebian king Miro rapidly agreeing to a treaty which included paying tribute,