In 788, he captured Chorso of Toulouse and made him swear a humiliating oath, either to himself or to Lupo II. Upon this Chorso was released, but Charlemagne dismissed him from his post. This incident gives rise to the notion that Adalric was in fact an independent Basque duke in Gascony, though others interpret him as a rival Carolingian count.
According to the spurious Charte d'Alaon, Adalric was captured by forces of Charlemagne and exiled to Spain, later being killed in battle. This charter also makes him the father of Seguin I of Bordeaux and Centule. His relationships are, in fact, unknown.
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