Although the Arevaci later, in 29 BC, contributed an auxiliary cavalry unit (the "Ala Hispanorum Aravacorum") to fight alongside the Roman legions in the first Astur-Cantabrian war, Tacitus cites heavy taxation as the major reason for a revolt in the Termes region which resulted in the ambush and assassination of Lucius Piso, "Praetor" of H. Citerior in 25 AD.