premise: The Visigoths gradually adopted the culture of their Hispano-Roman subjects under Reccared I in 589.
hypothesis: Reccared I . The Visigothic kings and nobles were traditionally Arian Christians , while the Hispano-Roman population were Roman Catholics . By this time the remaining ethnic distinction between the increasingly Romanized Visigoths and their Hispano-Roman subjects had all but disappeared ( the Gothic language lost its last and probably already declining function as a church language with the extirpation of Arianism , and dress & funerary customs also cease to be distinguishing features in ca. 570/580 ) Visigoths . In or around 589 , the Visigoths under Reccared I converted from Arianism to Nicene Christianity , gradually adopting the culture of their Hispano-Roman subjects .