The Aribonids were a noble family of probably Bavarian origin who rose to preeminence in the Carolingian March of Pannonia and the later Margraviate of Austria (marcha orientalis) in the late ninth and early tenth centuries.
Margrave Aribo succeeded William and his brother Engelschalk I in the Bavarian March of Pannonia in 871, after both had been killed fighting against Great Moravian forces.
In result, the Aribonid dynasty had a long-sustained feud with the Wilhelminers in the late ninth century.
They lost their influence after they got involved in a 1055 insurrection led by Duke Conrad I of Bavaria against Emperor Henry III.
In fact, the family provided many high ecclesiastics; Bishop Piligrim of Passau (971–991) as well as the archbishops Aribo of Mainz (1021–1031) and his brother Pilgrim of Cologne (1021–1036) were Aribonids, as their names would suggest.