Aribo maintained peace with Svatopluk of Moravia and it paid off when, in 882, the son of the late margrave Engelschalk, Engelschalk II, rebelled against him, claiming the rights to the march.
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Aribo was originally appointed to succeed the brothers William and Engelschalk I after they died on campaign against Moravia.
At first mocked and scorned even there, with the passage of time he came to be revered as a saint and his advice was sought by the great: he was acquainted with the Empress Kunigunde, Bishop Meinwerk of Paderborn and Aribo, Archbishop of Mainz.
Millstatt Abbey was founded as a proprietary monastery by the Chiemgau count Aribo II (1024–1102), a scion of the Aribonid dynasty and former Count palatine of Bavaria, and his brother Poto on their estates in the newly established Duchy of Carinthia.