The majority ethnic group were the Ibanags the reason why the Ibanag language had spread throughout the valley region prior to the arrival of the migrating Ilocanos .
The Ibanags were first seen by the Spanish explorers and converted to Christianity by missionaries .
The majority ethnic group were the Ibanags , who were first seen by the Spanish explorers and converted to Christianity by missionaries , the reason why the Ibanag language had spread throughout the valley region prior to the arrival of the migrating Ilocanos .