Aillarehue or Ayllarehue (from the Mapudungun: ayllarewe/ayjarewe: "nine rehues"); a confederation of rehues or family-based units (lof) that dominated a region or province. It was the old administrative and territorial division of the Mapuche, Huilliche and the extinct Picunche people. Aillarehue acted as a unit only on special festive, religious, political and especial military occasions. Several aillarehues formed the Butalmapu, the largest military and political organization of the Mapuche.