There is a part of the Cordillera ranges which is home since time immemorial, to hundreds if not thousands of mountain or hill dwellers(Ygorot) but they are not included in the history or as part of the Cordillera. It must be remembered that the Cordillera ranges extended straddling to the south and northern part of Luzon; and to the east to Cagayan-Isabela valley or to the Caraballo mountain, and to the Ilocos norte and Sur, La union and Pangasinan. In the western slope of the Cordillera are villages of "hill dwellers"(Ygorots) called Bago or bagbag-o tribe, and they speak kanakanaey but not alike the dialect of the Kanakanaeys of Benguet; and they also developed a iloko dialect like that of the Ilocano but not as pure as the iloco lenggua franca of the ilocanos. there are many words that ilocanos can not understand. this ilocano-like dialect could have developed because they are very adjacent to the lowlander ilocanos that they adapted the ilocano vernacular which became interpresed with their their own words which most even ilocano do
not know its meaning. But these Bagos remain hill dwellers in their native culture and practices. They have their own gongs and dances and other practices the same that of the upper igorots: besao, bontocs, sagada, etc. It is wrong to say that these ygorots are ilocanos because they are located in ilocos sur or Launion. the mountainous areas they inhabited is a part of the Cordillera ranges. It was by Congressional acts before WW2 that these places were incorporated in the political jurisdiction of Ilocos and La Union perhaps because these places of the Bagos are very adjacent to the lowland Ilocos that they were politically annexed as political part of the lowland. It is good that Besao which is near Cervantes was not included then. otherwise the Besaos could be then called ilocanos by reason of the political affiliation of their native place.