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The Visigothic kingdom in the early 6th century worried about possible Frankish expansion into their territory. Visigothic king Amalaric of the Balt dynasty married Chrothilda, the daughter of the Frankish king Clovis I. Chrothilda was catholic while Amalaric held onto the arianism. Eventually Amalaric converted to catholicism, a feat which Chrothilda is often credited with.
What if Amalaric had stubbornly refused to convert to Catholicism?