A sign of Aribo's strength after this was that he was unable to be unseated by Arnulf when the latter succeeded as King of East Francia in 887. In 893, Arnulf appointed Engelschalk II to a portion of the Pannonian march over Aribo's head. Aribo never reconciled with Arnulf after the Wilhelimner War and his contacts with the Moravians were kept secure. After his falling out, his son Isanrich got Moravian support against Arnulf. Around 905, Margrave Aribo issued a customs code concerning the trade along the Danube river at Raffelstetten. He survived the disastrous Battle of Pressburg, whereafter most of the margravial territory was lost. He last appeared in a 909 deed, when he and Archbishop Pilgrim of Salzburg were vested with Altmünster Abbey by King Louis the Child.