In 1927, a Philippine Constabulary (PC) Commander assigned in the area, Ist Lt. Catalino Javier, initiated the development of some portions of the municipality. Seeing the natural bounty of the area, he invited settlers from Luzon and Visayas to migrate in the area. The first wave of settlers who dared develop the wilderness was the late Antonio Labasan from Zambales. Among his companions were 23 interrelated families, the Rosete, Almazan, Dumlaos, Flautas, Fernandezes, QuiÑones,Fermils, Fantones and Documos who settled at Sitio Salunayan and Bual . Visayan settlers from Pikit also came to settle at Bual - the place of Datu Guiambangan Dilangalen. The Visayan migrants were headed by Gregorio Bingil, Julio Anito and Tomas Cantoy.