What is "aribonids"

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. The dynasty is named after its ancestor Margrave Aribo of Austria (d. 909). The Aribonids maintained influence in the Duchy of Bavaria, the Austrian march, and other parts of Germany (the Saxon eastern marches and the Rhineland) until the early twelfth century, when they disappear.